I agree with Alan although I've never used an import agent and it may well be worth the money for the hassle that's involved.
Having said that it's a few forms and then time basically. They will probably insist that as a private individual you are there with the boat and all the forms when THEY are ready.......which might be inconvenient depending on where you had it shipped to.
Wouldn't a friendly colleague to colleague phone call through the coast guard to your local customs and excise be worth a....cough, cough...nudge, nudge....wink, wink......and maybe you'll have a friendly helpful C&E officer to guide you through the process!?
On the other side of the coin exporting was dead easy.......barnet marine did it all for me and I didn't even have to be there!
Which part of "throw me the mooring line" didn't you understand!?