self or pro
Hate to be the bearer of bad news, but after being in the industry for many years, I have found that due to changes in the manufacturing process and cheaper materials now being used in the marine refrigeration industry, it is usually best to have the system professionally installed, charged, and tested. These so called pre-charged sytems are usually in need of some service after installation due to human error, faulty components, or mishaps in the manufacturing process. It will save you a lot of headaches in the future, the work will be guaranteed (if done by a reputable company)and there will be no worrys about leaking couplings, poor factory solder joints, non-marine type components deteriorating and many other problems associated with the cost cuts that are always present in any industry. Do yourself a favor and have it done by a pro. The bonus?... You will be supporting the smaller local businessman. Who can argue with that? (again, ONLY IF THEY ARE REPUTABLE!!)