You should really look around the regional forums. I'm not mechanically inclined at all. I managed to meet with another very nice owner who showed me how to do it myself. I was able to spend that money on other mods. Good luck.
It would also depend on how man inches you are lifting your rig. The cost can vary depending on the complexity. A lot of memebers here are extremely knowledgable, just post some specs about what you want to do and they will help you with what you would need or approx. costs.
if you need to purchase a lift, have it installed by a professional and purchase, mount and balance the new tires plan to spend around $3000 - that is if your wanting a 3" suspension lift. There is a section of the forums dedicated to lifts and suspensions. lots of good info there. Do a search for "lifts", learn a lil bit, then search for more specific topics like "suspension lift" or "spacer lift" etc... I have learned.. that perty much, if there is a question then it has already been asked, on these forums. Heck, just google your question about an FJ and the good result will prob bring you right back here! crazy!