I Need Help!!! PSP FW 3.71 But I Wan2 Get Emulators On It

Rite pepz i need ur help like i said i have a PSP model 1000 i think it was the launch one? my wee couzin borrowed it and the firmware is now at 3.71 so firstly id wan2 downgrade so i can use emulators?! But i have read and tired sum of the stuff on this site and it doesnt work but also i dont understand sum of the instructions im like completely nu at this so if ya could help that would be great PS i wil prob need stuff to be explained to me like really simplified??! Thanx:thumbup: