Not sure what type of chassis you have but if it is a Ford Super Duty then I would pay a shop to install the fronts, at least. I replaced the rear shocks on my E-Super Duty when I had that coach, and had a shop do the fronts. It is really difficult to get in there and work on them, especially if they are old, seized or rusty. I had to cut the shaft off with a Sawzall on one rear shock and the shop had to use an air chisel on one front, as it had seized. Also, most shocks come with a strap holding the shock in the compressed position. Be sure not to cut that until you aim the shock at the mount. It is tough to compress the shocks to get them in.