04 needs lowering

Alright first of all my friend has an 04 king cab frontier and he is getting 22's within the next couple months and he wants to drop it hopefully 3 inches. i read up on other posts about lowering the truck. i can do the back with the blocks that is no problem. i have no experience however with the torsion bars. do i need a special tool or can i use a rachet set? Also will a haynes manual show me where the bars are and how to adjust them? As well if you have lowered yours what brand and model springs did you get for the front and how hard were they to put in? I am planning on the two of us doing this. Except for the alignment part. thanks for the info