Law / A parent born in Poland. Obtaining a Polish birth certificate? [38]

Hi

I'm seeking some help as I have been struggling to make a start..

Ultimately I am wanting to obtain my Polish citizenship. I am Australian born to both Polish parents. My father passed 6 years ago and my mother I don't speak with. I know their date of births and place of births however I do not have the birth dates for their parents (my grandparents).

How can I go about getting copies of my parents birth certificates to start my citizenship process? Is it easier if I go to Poland to sort this out like @Iza22 mentioned?? I have contacted an agent/solicitor but it is ridiculously expensive!

I'd greatly appreciate some guidance.

Thanks in advance.