it is a fairly easy and straightforward job, don't really have to be too handy. do you have a 2 or 4 wheel trailer? Brakes?
all you need is a few simple hand tools and some type of parts cleaner, the bearings probably aeren't bad. i always re-pack mine yearly, new seals and clean/replace bearing buddy's as needed. eastern marine in newark de does the work i believe, but anyplace that sells trailers, even storage , lawn & garden types ought to do the work.
I live 30 min south of you. Bring the trailer over and I'll do it in exchange for a fishing trip. If the trailer is to far gone I might be able to get up there, but would be easyer for me to do it at my house.Email me if this suits you.