I've gone and done it and bought Misty Blue, my first boat! Not wanting to do things by half, I bought it from a chap in London by Little Venice and then had to get to the Macclesfield canal after hiring a boat for a week! Had to borrow a friend who'd been on one before. It involved the Grand Union, Oxford, Coventry and Trent and Mersey before hitting the Macclesfield canal, and took exactly 2 weeks. Fortunately the on board shower worked well, as the only showers we passed were at Bosley Locks and they were broke!
Talking of locks, we must have gone through about 160 of the blighters, the worst being the big double gated locks down south.
Two things became apparent fairly early on that a surveyor couldn't see, one was the stern gland letting water in so a lot of grease was used getting home, and the engine electrics packing up at Bosley Locks due to a bundle of wires melting together as they were stuffed under the hot engine! We couldn't turn the engine off even using the emergency stop, so had to turn off the diesel feed. Fortunately a friend didn't live far away and turned up with a load of electrical repair stuff and managed to cobble the wiring together again, and we got back. The joys of boating!