I installed mine , it was not extremely difficult , just need mainly basic hand tools. I have Mor Ryde suspension on mine and is a little different , than the Trailair . I had a little learning curve on the first leaf on reinstalling , it was much easier to line up , depending on which end I hung back first. Just make sure one has sockets ,wrenches , pry bar and a BFH. I have a impact that made things easier and will need a jack to raise axle up and down to align things.
If I could find someone do mine now for 50 bucks I would gladly pay them to do it though. The bolt ,install fee Lippert has offered at the rally is a great deal. The wet bolts are alot better than than the stock bushings but they will last a pretty good while and no great hurry needed to install them on a new rig.
If you install them yourself make sure you install them with the zerks facing away from the tire or you will have to remove tire to get to some. I also changed some of my zerks to angled ones to make them easier to to get to. I would suggest trying to grease bolts before install, I found about half of the zerks wouldn't take grease , must have been made in China.......Kenny