I wish to upgrade to 2.0,2.0.2, i don't care, i just want the appstore and cydia, i kno itunes will backup up all the stuff i need.

What I Got:
Windows Vista
T-Mobile
1.1.1 (3A109a)
04.01.13_G

Got mine last november, if that matters.

Plz shead some light on a safe method to upgrade to 2.0, or point me 2 a good faq, guide etc.