water will dribble out of the hoses, so put the ends in a bucket when you disconnect them.
The waste pipe from a dishwasher or washing machine, quite a bit of water may come our if you lie it flat on the floor, or drop it, so put the end on a tray to drain. If you lean the machine over, more of the water it contains may come out.
Tumbledrier hoses often have a lot of dust and fluff in them.
You will find installation instructions on the manufacturers' websites.
Cookers usually are hard wired (no plug) and need a modest amount of competence to disconnect the large cable. You must of course turn off the power at the consumer unit first, and not turn it on until the plastic cover has been screwed back over the connection block, with no exposed live parts or wires. The terminal screws for large cooker cables have to be done up very tightly, and tightened again after a week or so as the soft copper will compress.
Don't slide your appliances over the new floor, or it will be marked, dented or scratched. Put a thick cotton towel under them. For the final push under the worktop, clean the floor thoroughly and spray it with WD40 immediately before pushing it in. Or buy and fit mobility trolleys (with rollers) under each appliance.