Most shops will charge $450-$500 to install it, and it's worth every penny IMHO. It is not as complicated as an engine or tranny overhaul, but it will take a weekend to do for a "first-timer". The rear axle is very simple, just add blocks under the leaf springs or replace with lifted packs, add longer shocks, and check the pinion angle for the driveshaft. Most blocks are tapered to keep the ds angle near "0" degrees to keep from eating ujoints.
The front axle is the fun part, seems like every bolt has Loctite on it from the factory. You will need a Pitman arm puller, and may even need to heat the stock arm to remove it. You will be installing a "dropped" Pitman arm for the steering, longer coil springs and shocks, axle pivot dropdown brackets, and either drop down brackets for the stock radius arms or extended arms which require re-locating the bracket mounts further back. Removing the stock bolts may be easier if you soak them with PB or penetrating oil for a couple of days, and air tools or a long cheater bar will help. The hard part will be lining up the brackets and their bolts, as everything has now moved from before. Use at least two floor jacks, jack stands for SAFETY, and a come-along if you have one. This is the best time to replace the factory suspension bushings with new ones or polyurethane bushings. Then go straight to get an alignment done on the front end, as the camber, caster, and toe-in will be way off.
It took a shop 3 days to install the lift on my 84 Bronco, due to stubborn, rusted bolts. I knew it would be rough, as I have lifted a few TTB trucks in the past. It will not be as bad on your 95, but the front axle weighs about 500 lbs. Get a couple of strong buddies to help you if you decide to tackle it.