Well we have just done it we are now liveaboards on our 60ft semi-trad.
All going well,
My tips.
1.Get used to spiders
2.Learn to duck your head when entering and leaving the boat.
3. Do the RYA IWHC boat handling course.
4. Make sure you have a spare cylinder of gas.
5. Get your engine and Heater serviced in the summer ready for winter.
6. Get a survey done and if you can get it blacked and all other out of water jobs done at the same time ( new anodes, top/bottom tiller bearing replaced and prop shaft replaced if required as its expensive to pull a boat out for such repairs)
6. Get safety critical things checked smoke alarms, extinguisher, gas equipment etc.. anything that if not working could kill.
Regards Matt