You could probably hire the more specialised tools you'll need. Router and worktop jig / Core drill and core bit, possibly circular saw and jigsaw.
When you take the old kitchen out, mark a datum line on the walls where your units are going , usually 870 mm up from the floor. Check that the floor is level, by measuring down from the datum line at various points . If any measurement is smaller than the 870mm, then re-mark the datum line from the highest point of the floor (wherever the measurement is the smallest)
Make your units up as per MI's but don't fit the doors/drawers yet. Start fitting the base units from a corner, adjusting the legs until the first unit is level and plumb (can take a bit of doing) Fix this one to the wall. Place the next unit in place and level up as before. Once it is level and plumb with the first unit, drill and screw this unit to the first. (I usually clamp them together whilst drilling and screwing them together) Carry on down the row of units in manner, checking that they are plumb and level.
Wall units are done in a similar fashion (depending upon the type of wall fixings they have) Where you have the extractor going, check the MI's of the hob, for minimum clearances from hob to wall units. I usually mark the middle of the hob on the wall and plumb a line up then measure out each way to set the positions of wall units. Fit wall units once your happy about where they're going (screwing and drilling them to each other like the base units) You might want to consider drilling the hole for the extractor before moving on to the worktops. Follow the MI's as to height of extractor etc. Protect the units directly below and either side of where your drilling the hole.
Cut the worktops to length etc and router any corner joints (as per instructions that should come with the jig). Mark where cutouts for sink/ hob etc are going (following MI's instructions. Cut these out. You may need someone to help you lift the worktop back on to the base units when the cutouts have been done, as these can seriously weaken the worktop. Seal the edges with varnish before fitting sink and hob. You might have to cut out some bits of the base units where the sink and hob are going so with the worktop back in position, mark and cut any bits that have to come off the base units before fitting the sink to the worktop and lifting the worktop back on.
If there are any corner joints that you have routered, bolt these up once the worktop is in position using worktop connector bolts and colorfill or silicon on the faces of the joint (Warning, with colorfill, you have to work very fast to bolt the worktops together before the colorfill goes off. ensuring the worktops are level with each other)
Once you've done all this, connect the water to the sink and the waste etc to it and check for slight leaks. If everything is fine, fill the kettle up and have a cuppa before tackling anything else.
Protect the worktop now with the flattened boxes the base and wall units came in. Fit the hob (if it's a gas hob, you'll need a gassafe registered installer to connect it up)
Finally, fit the doors/drawers. drill and fit handles/knobs. fit plinths etc ( and a point for the wife's chain)
Admire your handiwork and expect praise from er indoors (until she points out the obvious bits).
This guide is not exhaustive in any way or form, as individual circumstances / conditions vary. No responsibility is accepted, should you get it completely wrong and the wife isn't completely satisfied.
