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Definitely break it down - it's honestly not as daunting as it may appear, despite the below:
We had some time issues... : ) I did about a week on my own for the first batch of stuff. Then trades sporadically came in over about 5 weeks due to them being flaky and deciding on the morning, "nah I'll go to the pub instead" and bad scheduling. If I'm being fair we had a worktop delivery come at 11pm when it was supposed to come at 8am that morning instead and trade availability had to shuffle - but still 5 weeks was nuts.
In total it took about 7 weeks including some time after the trades had finished to do things like painting. Which was about 4/5 weeks longer than I'd anticipated.
Also on costs, just went back over emails:
1.5k for all appliances (ao.com)
2k for units/worktop (diy kitchens)
4k labour (company now out of business in sussex)
300 Tiles/paint etc. (b&q)
1.8k pantry removal/steel install etc. Also included new front and back doors to the house/locks etc.
Same as us really - I did the demo work and ripped everything out, I did the unit installs (though they came pre-assembled which was a great help), I did simple plumbing but I had a carpenter do the worktop, tiler do the walls and floor, a plasterer render the walls and then electrician and gas safe engineer do the hob/lights/sockets etc. Including all fees and all appliances/units/tiles/paint etc ours was about 10k from memory though I may have rose tinted specs on. Oh - we also had steel inserted after we knocked down a tiny, awkward pantry to make use of the space - that was probably the biggest single cost from that 10k - maybe 2 or so.
Nice kitchen though. Absolute state now, mind, with a baby - but we had a great 3 months before then.
Perhaps someone with leccy knowledge can talk about actually installing the extractor. But as for actually fitting the thing, it's relatively straight forward if you know how to use a tape measure and have something like this:
https://www.google.co.uk/search?dcr=0&source=hp&ei=UO6PWpmIGIX8gAa7rpKYBQ&q=core+drill+brick&oq=core+drill+brick&gs_l=psy-ab.3..0j0i22i30k1l7.820.2298.0.2440.17.15.0.0.0.0.200.1771.5j9j1.15.0....0...1.1.64.psy-ab..2.15.1766.0..46j35i39k1j0i131k1j0i46k1.0.s_nqYx6vdIU
And we did the design ourselves. Unless you live in an Escher painting I think it'd be OK.
Have a play around on things like the kitchen planning software on Ikea: http://www.ikea.com/gb/en/customer-service/planning-tools/kitchen-planner/