Typical dive is about 1-1 1/2". So raising the front with 5100s about 1- 1/2" will make your truck set back to normal.
If you order the 5100s, they will have direction and information on height settings.
If you do FJ coils, you'll get 1/2-1"+ of lift and you can set the 5100s at 0" lift, as your coils will be providing the lift.
I did my truck with 108k miles. I found all 4 corners were in need of replacement. The rear shocks were in pretty bad shape. I did OME coils and Bilstein 5100s for about $650. You could do FJ springs and 5100s on all corners for a very moderate lift (1.5") for about $450-500. You may figure that, at 100k miles, it may be in need of replacement as well, and do a mild lift or replace the shocks and coils with OEM spec units.
I figured, the truck needed a new suspension anyway, might as well do the lift while I was at it. I really like the 5100s and they pair nicely with the Old man Emu Coils.
About the lift install:
Only tools I used were 17mm wrenches/sockets, 3/4" wrenches/sockets, follower pin, crowbar, 6mm allen wrench, torque wrench, rachet strap, strut spring compressors (not completely necessary) and misc. Jacks/stands. I didn't use an impact, but one would have come in handy. You could potentially rent an electric torque wrench for 20-25 bucks and make your life easier.