Prima di uscire, mi cambio e mi vesto con calma.

Because after prima di in Italian, you normally use the infinitive when the subject is the same as in the main clause.

• Prima di uscire = before going out / before I go out
• uscire is the infinitive: to go out

In this sentence, the person who goes out is the same person who changes clothes and gets dressed, so Italian uses the infinitive.

If the subject changes, Italian usually uses a full clause instead:

• Prima che lui esca, mi cambio. = Before he goes out, I get changed.

So:

• prima di + infinitive = same subject
• prima che + subjunctive = different subject

Here uscire means to go out or to leave the house / leave for somewhere.

It is a very common verb in Italian:

• Esco adesso. = I’m going out now.
• Vuoi uscire stasera? = Do you want to go out tonight?

In this sentence, prima di uscire means before going out, usually in the everyday sense of getting ready before leaving.

Because both verbs are being used reflexively.

• cambiarsi = to change oneself / get changed
• vestirsi = to dress oneself / get dressed

The pronoun mi means myself and agrees with the first-person singular subject I.

So:

• mi cambio = I get changed / I change my clothes
• mi vesto = I get dressed

Italian uses reflexive verbs much more often than English does in this area. English often leaves out myself, but Italian usually includes the reflexive pronoun.

They are similar, but not identical.

• mi cambio usually means I change clothes or I get changed
• mi vesto means I get dressed

So the sentence suggests a sequence like:

1. I change what I’m wearing
2. I dress myself / put on my clothes

In everyday speech, there can be overlap, but the nuance is still useful:

• cambiarsi focuses on changing
• vestirsi focuses on putting on clothes / being dressed

For example:

• Mi cambio dopo la palestra. = I change after the gym.
• Mi vesto in fretta. = I get dressed quickly.

Yes, but it is not exactly the same in tone or structure.

• Mi cambio is the most natural everyday way to say I get changed / I change clothes
• Cambio i vestiti literally means I change the clothes, which can sound less natural unless you are specifically focusing on the clothes themselves

More natural alternatives would be:

• Mi cambio
• Mi cambio i vestiti in some contexts
• Cambio vestiti can also be heard informally

For a learner, mi cambio is the safest and most idiomatic choice here.

Because object pronouns like mi, ti, si, ci, vi usually come before the conjugated verb in Italian.

So:

• mi cambio
• mi vesto

Not:

• cambio mi
• vesto mi

This is the normal position with finite verbs.

The pronoun can attach to an infinitive instead:

• vestirmi
• cambiarmi

For example:

• Devo vestirmi. = I have to get dressed.
• Prima di cambiarmi, chiudo la finestra. = Before changing, I close the window.

Con calma means calmly, slowly, or without rushing.

Literally, it is with calm. Italian often uses a noun phrase with con where English would use an adverb.

So:

• mi vesto con calma = I get dressed calmly / I get dressed without hurrying

This is a very common expression:

• Parla con calma. = Speak calmly.
• Facciamo tutto con calma. = Let’s do everything calmly.

It gives a natural, everyday tone.

The comma separates the introductory time phrase from the main part of the sentence:

• Prima di uscire, = introductory element
• mi cambio e mi vesto con calma. = main clause

In English, we often do the same:

• Before going out, I get changed and get dressed slowly.

In Italian, the comma is common and helpful here, especially at the beginning of a sentence, though punctuation can sometimes vary depending on style.

Yes, vestire can be both reflexive and non-reflexive.

Reflexive:

• Mi vesto. = I get dressed.

Non-reflexive:

• Vesto il bambino. = I dress the child.
• Quel negozio veste uomini eleganti. = That shop dresses elegant men.

So:

• vestirsi = to dress oneself
• vestire qualcuno = to dress someone

That is why the mi matters: it shows that the action comes back to the subject.

Yes, you may see it written without the comma, especially in less formal writing. It would still be understandable.

However, with an introductory phrase like prima di uscire, the comma is very natural and often preferred because it makes the structure clearer.

So:

• Prima di uscire, mi cambio e mi vesto con calma. = standard and clear
• Prima di uscire mi cambio e mi vesto con calma. = also possible

Yes, e simply means and.

It links the two actions:

• mi cambio
• mi vesto con calma

So the sentence presents two connected things the speaker does before going out.

A useful point for learners: unlike English, Italian e does not change spelling before vowels. It always stays e.

Examples:

• pane e acqua = bread and water
• mi cambio e esco is grammatically possible, though in speech you may hear it flow together naturally

Yes. Mi cambio and mi vesto are both in the present indicative.

Italian often uses the present tense for:

• habitual actions
• routines
• things happening now
• near-future contexts, depending on context

So this sentence can describe a routine:

• Before going out, I get changed and get dressed calmly.

It does not have to mean only this exact moment. Very often it sounds like a habitual action or personal routine.