Richy - we (wife and I) fitted our own kitchen and bathroom... Kitchen was a bit of a stress fest but not that bad a job to do. Got a Maple number from Jewsons, think all the units, benchtops, sink, tiles and other bits came to just over £1,000 and we\'ve packed a lot of units into the kitchen for that too.
Most of the work is pretty straightforward, the only stuff you might need some real help with (if you do it yourself) is the electrics and plumbing. Bit of planning and you can probably do the majority of the work in only a couple of days.
Bathroom was just a cheap one from B&Q for a couple of hundred quid, everything was just a case of replacing the old stuff though (no major changes to layout etc).
Ohh - double glazing, we had GoldSeal from Norham road (n/shields) do our windows, they\'re nowt fancy but certainly cheap enough and the lads did a good job putting them in. Back door I got from Wickes and fitted myself (£179) and front door from Morrisons glaziers at Ashington (£300 ish).. pays to shop around and mix-n-match for the bargains.