Not hard at all. No need to do without services during the project, even while working. Power only needs to be entirely off for transferring over to a new consumer unit. Everything else can be isolated and electricity is trivially easy to organise temporarily. Plumbing is also easily isolated and not difficult to arrange temporary provision.
My brother and I built my kitchen entirely from scratch in 5 days. Stripped right back to base brick and concrete. Tore out and replaced the ceiling. Levelled and tiled the floor. Replaced and enhanced all plumbing and electricals. Fitted units, counters, appliances. Only job hired in was a superb finishing plasterer. We had power and water the whole time.
Rewired my house with a friend over 5 days, including repairing floor areas we tore up and plastering channels.
Hiring reputable contractors can get the work done quicker and easier than doing it yourself, and these aren't projects for beginners, but it's good to know your home inside out.