before doing my own, i priced it out. the hours calmini told me a pro would need was between 6-8 hours of work. the going rate around here is $80 (called several shops). So, depending on rates where you live, I wold plan for 500-700, then add in incidentals like the alignment, additional supplies, etc.
one issue you may run into is that many shops will not install a lift they did not sell you, so before you buy, if you aren't planning to do it yourself, check around.
also, there is a thread on XOC that has hints from a couple of installs. check it out and you will find a couple of items you need calmini to either send different bolts, or stuff the shop will have to mod that are not included in the instructions. no biggie, but stuff that you need to know or your shop will.
good luck. it was kind of a fun install, but it did take me a bit of time as i had never done one before.