La entrevista resulta menos difícil cuando hablo con calma.

Resulta adds a nuance of turning out to be or coming across as. It sounds a bit more like the speaker is describing their experience of the interview rather than stating a simple fact.

• La entrevista es menos difícil... = a more direct statement
• La entrevista resulta menos difícil... = the interview feels / turns out to be less difficult

In Spanish, resultar is often used this way to talk about how something seems in practice.

Both are correct and very close in meaning.

• menos difícil = less difficult
• más fácil = easier

Spanish often uses either structure depending on style or emphasis. Menos difícil keeps the idea of difficulty in focus, while más fácil sounds a bit simpler and more everyday in many contexts.

So:

• La entrevista resulta menos difícil...
• La entrevista resulta más fácil...

Both are natural.

Spanish, like English, can leave the second part of a comparison understood from context.

Here, menos difícil usually implies something like:

• less difficult than usual
• less difficult than when I don’t speak calmly
• less difficult than I expected

The sentence does not need to say this explicitly if the comparison is already obvious from the situation.

Because here cuando refers to something that happens regularly or habitually: whenever I speak calmly, the interview becomes less difficult.

So Spanish uses the present indicative:

• cuando hablo con calma

If you were talking about a future situation, Spanish would normally use the present subjunctive:

• cuando hable con calma = when I speak calmly / when I do speak calmly in the future

So the choice depends on meaning:

• cuando hablo = whenever I speak / when I speak generally
• cuando hable = when I speak in the future

Spanish often leaves out subject pronouns because the verb ending already shows who the subject is.

• hablo clearly means I speak

So:

• cuando hablo con calma
• cuando yo hablo con calma

Both are possible, but the version without yo is more normal unless you want emphasis or contrast.

For example:

• Cuando yo hablo con calma, pero tú no...
  Here yo is used for contrast.

Con calma is a very common Spanish expression. Here it means something like:

• calmly
• without rushing
• in a relaxed way

It is often more natural in everyday Spanish than using an adverb like calmadamente.

So:

• hablo con calma = I speak calmly / I speak without rushing

You will hear con calma a lot in Spanish in many situations:

• Hazlo con calma = Do it calmly / Take your time
• Vamos con calma = Let’s go slowly / let’s not rush

Yes, the word order can be changed.

The original order is very natural:

• La entrevista resulta menos difícil cuando hablo con calma.

But you could also say:

• Cuando hablo con calma, la entrevista resulta menos difícil.

Both are correct. The difference is mostly about focus:

• starting with La entrevista puts the focus first on the interview
• starting with Cuando hablo con calma puts the focus first on the condition

Spanish word order is flexible, especially with time clauses like cuando...

In Spanish, nouns usually need an article or another determiner. So entrevista by itself would normally sound incomplete in a sentence like this.

• la entrevista = the interview
• una entrevista = an interview

Here, la entrevista suggests a specific interview that the speaker and listener can identify from context.

Spanish uses articles more regularly than English, so learners often notice them where English might be less explicit.

No. Entrevista can refer to several kinds of interview, such as:

• a job interview
• a media interview
• an interview with a teacher, doctor, or official

The exact meaning depends on context. If this sentence appeared in a job-hunting situation, most people would understand it as a job interview, but the word itself is broader.