Awww, thanks guys. I'm feeling much better today 
. The electrician is NOT here. But the man who is making my built-in furniture is, and he's brilliant. The best thing was that - totally without prompting - he jokingly said "Are you sure you want warm white lights on your bookcase, and not bright blue ones so it looks like a tacky bar?" 
redjelly - I had my builder do it, and if I were doing it again, I would get a professional kitchen fitter instead. The skills are quite different - you want someone who can do second fix with finesse, and many builders aren't really great at this. I literally had to stand over mine and insist over all sorts of things, and it was very stressful. However, I have heard horror stories of terrible kitchen fitters, so I think it would be well worth finding the 'right' guy - by personal recommendation if possible.
DO check out online review for Wren. They have terrible feedback. Ikea do 0% finance on their kitchens, which is really great - but be prepared for issues with them.
thankyou - I'm really wondering the same thing! And coming to the conclusion that I'm prepared to do things that I feel skilled enough to do (and my skillset is small!) but that I'm not prepared to do work where it's clear that I've paid someone else to do it. So I'm happy to Danish oil some wood, to varnish some doors, and to touch up the paint, but I'm not doing stuff like fitting handles on kitchen doors.