/ Help with bureaucracy in Poland regarding citizenship
Can you prove that your grandfather and your mother didn't take up any other citizenship before 1962? Under the 1951 and 1920 Polish citizenship acts, that would have lost them their citizenship. Under the 2009 citizenship act lost citizenship can be reclaimed but only by the person who lost it.
It's not quite correct. Not always a man, in this case your grandfather would lost a Polish citizenship even if he became a citizenship of a different country.
It depends on a case if you need to hire someone to help you to prepare an application, a person who would help you obtain required certificates etc. If you do have most of documentation in you possession, you may do it by your own or/and if you need to obtain documentation from Poland and you know how to it. Please also note that you would need to have a proxy based in Poland to receive letters from a Polish authority if you decided to submit an application of confirmation Polish citizenship.