come on... why are you so pesimistic... its worth updating...
here is what you have to do
1)do a back up of your apps thems calendar etc with the application on the phone
2)disable all instant messaging accounts
3) disable all resposities on app manager except those of nokia
4)delete as many apps and themes as you can to free up enough root-fs
5)do a reboot
6)update (thats an order )
after you update
1)re-enable your instant-messaging accounts
2)re-enable all respsities on app manager
3)restore your apps from the back-up you have done earlier
4)tell me if it worked