W sobotę pójdę do fryzjera, a potem do fryzjerki mojej kuzynki, bo chcę nową fryzurę.

Because with days of the week, Polish normally uses w + accusative to mean on a particular day.

• w sobotę = on Saturday
• w niedzielę = on Sunday
• w poniedziałek = on Monday

The base form is sobota, but the accusative singular is sobotę.

So W sobotę pójdę... means On Saturday, I’ll go...

Pójdę is the 1st person singular future form of pójść.

• pójść = to go, as a completed single trip
• pójdę = I will go

It fits well here because the speaker is talking about a planned future action: one trip on Saturday.

Compare:

• idę = I’m going / I go now
• pójdę = I will go

So W sobotę pójdę do fryzjera is the natural way to say On Saturday I’ll go to the hairdresser.

Because pójdę is the normal Polish way to express a future single completed trip.

Polish often uses a perfective verb for this kind of future:

• iść = imperfective
• pójść = perfective
• pójdę = future of pójść

A form like będę iść is not what Polish speakers usually choose here. If you wanted an imperfective future, it would more naturally be something like będę szedł / będę szła, but that emphasizes the process of walking/going, not simply the planned visit.

So in this sentence, pójdę is the best choice.

Not necessarily in everyday usage.

Strictly speaking, iść / pójść are connected with going on foot, but in very common speech Polish speakers often use them more generally for going somewhere, especially for visits or appointments:

• Pójdę do lekarza = I’ll go to the doctor
• Pójdę do fryzjera = I’ll go to the hairdresser

Even if the person ends up taking a bus or car, this can still sound perfectly natural. If the means of transport matters, Polish may use another verb like pojadę.

Because the preposition do requires the genitive case.

So:

• fryzjer → fryzjera
• fryzjerka → fryzjerki

This is very common with places or people you go to:

• do lekarza = to the doctor
• do dentysty = to the dentist
• do fryzjera = to the hairdresser

So the endings change because of do.

They are gendered profession nouns:

• fryzjer = male hairdresser / barber
• fryzjerka = female hairdresser

In this sentence, the speaker first mentions a male hairdresser, then a female hairdresser.

That is why you see:

• do fryzjera
• do fryzjerki

No. It means to my cousin’s hairdresser.

The structure is:

• do fryzjerki = to the female hairdresser
• mojej kuzynki = of my cousin / my cousin’s

So the full phrase means:

do fryzjerki mojej kuzynki = to my cousin’s female hairdresser

This is an important distinction. The sentence is not saying the cousin herself is the hairdresser. It is saying the hairdresser belongs to, or is used by, the cousin.

Because kuzynki is in the genitive singular, and mojej agrees with it.

• kuzynka = cousin (female)
• kuzynki = of the cousin
• moja = my
• mojej = of my / my, in feminine genitive singular

So:

• mojej kuzynki = of my cousin / my cousin’s

This is a possession relationship, like:

• samochód mojego brata = my brother’s car
• dom mojej siostry = my sister’s house

Because chcę takes a direct object, and here that object is in the accusative case.

Base forms:

• nowa fryzura = a new hairstyle

After chcę (I want), it changes to accusative:

• nową fryzurę

So:

• chcę nową fryzurę = I want a new hairstyle

Both words change:

• nowa → nową
• fryzura → fryzurę

because fryzura is a feminine noun.

A in Polish does not only mean but. It can also connect clauses in a way that feels like and, while, or and then, often with a mild sense of transition or contrast.

So:

• a potem = and then / and after that

In this sentence, it sounds very natural because the speaker is moving from one step to the next:

• first to one hairdresser,
• a potem to another one.

You could sometimes say i potem, but a potem is very idiomatic here.

Because Polish punctuation usually separates clauses more clearly than English does.

• The comma before a is standard when it joins two clauses.
• The comma before bo is also standard, because bo introduces a clause meaning because.

So this punctuation is correct:

W sobotę pójdę do fryzjera, a potem do fryzjerki mojej kuzynki, bo chcę nową fryzurę.

Usually in a sentence like this, it means this coming Saturday or on Saturday, depending on context.

If Polish wants to express a repeated habit, it often uses the plural:

• w soboty = on Saturdays

So:

• W sobotę pójdę... = On Saturday / This Saturday I’ll go...
• W soboty chodzę... = On Saturdays I go...

The singular here sounds like one specific Saturday.