Help. HOW TO guide for PyQt installation

[D. Xenakis]

Hi there,
Im searching for an installation guide for PyQt toolkit.
To be honest im very confused about what steps should i follow for a complete and clean installation. Should i better choose to install the 32bit or the 64bit windows version? Or maybe both? Any chance one of them is more/less bug-crashy than the other? I know both are availiable on the website but just asking.. If i installed this package on windows 8, should i have any problems? From what i read PyQt supports only xp and win7.
I was thinking about installing the newer version of PyQt along with the QT5. I have zero expirience on PyQt so either way, everything is going to be new to me, so i dont care that much about the learning curve diference between new and old PyQt - Qt version. I did not find any installer so i guess i should customly do everything. Any guide for this plz?

Id also like to ask.. Commercial licence of PyQt can only be bought on riverbank's website? I think i noticed somewhere an other reseller "cheaper one" or maybe i didnt know what the hell i was reading :). Maybe something about Qt and not PyQt.

Please help this noob,
Regards