Yea you can always run into some problems so give yourself extra time and another hand. My center pins on my leaf springs were rusted so bad I couldnt get 'em off so I had to grind them off. You can never tell what will go wrong.
W/ the use of air tools and things going semi-smooth- the front will take you about 15-20 min a side- and the rear 30min/ side (Granted you know what your doing)....
When we did mine we used hand tools and I did a chevy swap in the rear and got it done in about 5 1/2 - 6 hours. G/L man and do ur research
Compressing those darn front springs was a job in itself. Expect to spend a full day though. Probably take some heat to get your rear U-bolts off if you drive in winter road salt like I do. Make sure you have some new U-bolts as well. I took my front coilsprings to Midas and had a buddy put them in their fancy strut compressor to install the spacers, much safer to do it that way unless you feel confident in those cheesy compressors you can buy at Harbor Frieght.
I bought some cheap coil compressers from advanced auto for $26 and I've installed 4 lifts with them with out a problem, and I even use a craftsman 500ftlb impact wrech to compress with. But I would say to set a good weekend aside for you and a buddy, and just start spraying everything with liquid wrench about a week ahead of time. The u-bolts can be a bitch, and make sure you disconnect the sway bar in the front when you put the coilovers back in, because if you dont its nearly impossible to get the bottom bolt through the coilover. Its always good to have some good distructive tools (angle grinder, cut-off tool, and a good 3lb sledge) when doing a lift