Im like you, i dreaded the fact of breaking my iphone,
im in the uk and its a bit trickier to jailbreak it on 1.1.2, something about a baseband. lol god knows! lol
I wasnt really sure what i was doing, but i give it ago and i couldnt get it to work, i read half way through, this doesnt work for uk phones, GREAT! lol
so i just went into itunes and clicked restore, and it went back to 1.1.2 uk
perfectly not a problem, n then i had another go lol
so there really isnt much worry in my opinion, i just had another go with these instructions
http://modmyifone.com/forums/showthread.php?t=15837 and now i have 1.1.2 jailbroken uk.
Even my nan could follow these instructions
so i have 1.1.2 with loads of apps, its running the same speed and everything. cant see no difference between unjailbroke and not apart from the luvly things
Woodzey