Do you mean to lower just the rear? If so it is very straight forward and there are two ways you can go. You can either buy extension bolts or buy longer shocks. The only problem with doing it yourself is the fact that the old bolts are really in there and if you don’t have a lift they can be a pain to get to, but still doable. My father had his lowered by a local shop and they charged him 1 hour ($70). If you wanted to lower the front as well, that takes a lot of time and if you are not familiar with working on forks I would leave it up to the shop, but it is going to cost you. I would NOT lower the front by way of buying new triple trees and raking it out. That will only cause problems with handling. I don’t know why anyone would suggest you do it that way but some people are stupid. What chrome are you going to have them do? Unless they are going to send something to a machine shop to have a piece chromed (such as custom bars or wheels or something) I would do it myself. I have not seen any piece of chrome that Harley sells in its shop that one couldn’t put on themselves.