so i bought a polish pps and i was wondering if anybody new how hard it would be to make it into a sbr or if i could just pay the 200 dollars and then just cut the welds
It's apparently a little more involved than just cutting the welds. IIRC, CSMW in Missouri will do the work for like $100.00. Worth leaving it to a pro, IMO.
Not hard at all. On the earlier ones you would need few internal parts replaced as when you cut the welds some parts would be unusable. I'd say buy a parts kit for spares in any case as they are cheap. As long as you have some common sense, simple tools and decent google-fu you should be able to do it at home easily.