Me and my dad (who is good at DIY) fitted my kitchen. I bought all the cupboards flatpack from B and Q and built them. If you are buying cheap cupboards make sure the doors are a single sealed piece rather than made if multiple parts - it should prevent ingress of water/steam which can occur in the joints and then cause the laminate on the cupboards to bubble.
When you are fitting cupboard handles measure twice and drill once (or buy handleless cupboard doors?). TBF measure twice applies to everything.
The worst bit was cutting the hole for the sink - I don't have a worktable and clamps, so we ended up balancing it out the back door and I sat on one end while dad cut through the other end. My worktop was solid birch which was as cheap as laminate at the time, but it was really hard to cut through. I think if I was doing it one my own, a) a work bench would be essential and b) I'd probably have ended up going with laminate just for ease of cutting. Do you have people you can borrow tools from? If not I think buying the right tools for cutting the worktop may be a significant cost. I think if it had involved a corner I would have wanted someone to fit the worktop.
Plumbing wise, if you can use flexible tap tails and push fit plumbing you probably don't actually even need a plumber. My main recommendation is don't think you can reuse pipes. Sometimes you can but sometimes you just end up with tiny leaks from imperfections where you have taken them apart etc.
I think in theory you can get cookers that plug in with a plug so worth checking what you have already as if you do have that and can replace like with like you again might not need an electrician.
Can you get away with keeping and reusing the tiling? I had plain white tiles so just kept those - I think that would have been one of my biggest concerns if I had had to do it. What about the floor - again, are you planning to keep it? I guess you can probably get clickfit laminate or fit lino yourself tbf but I don't know how.