If it's,as you've said later, a smaller project then give it a go BUT don't underestimate the task.
Im 6 weeks in to doing our current place, 45sq m extension and full house refurb. I know sh.it loads but there is sh.it loads i don't know
. Project managing is all about knowing the timeframes, knowing the lead times, and knowing in advance the technical details, and solutions for them, ahead of time. Organising trades, materials as well as trawling through endless websites and brochures, locking in what you like and keeping budgets within limits is very time consuming. Our current place is our long term house so the finish, fit out and product choices are doubly important and doubly time consuming.
BUT if you can keep ahead of the curve (by doing the hours of thinking), trades will know what they're meant to be doing, bco will be happy, and you can really make a big saving on materials if you're not having to 'rush' buy things.
You can definitely save but never underestimate it. I know many people who have got themselves in a right mess thinking its 'a piece of pi.ss'.
The reason I don't mind employing individual trades is I know what I'm talking about, so can't be bull.bricked, plus it controls the job better financially ie people can get in a pickle with a do it all building firm if they don't control the money properly. If I'm not happy with someones work, attitude, reliability I can f.ck them off with little loss. Luckily most the guys I use are solid. Plus I can do bits myself, quite often things that will save me decent £'s (chasing walls for sparks, lay ufh, cladding, reroofing garage, plasterboarding etc etc) and it means I'm about to iron out any problems.