We're about to get some building work done involving the usual mix of
groundwork, brickwork, roofing, windows, plastering, plumbing, decorating
and electrics. I know that if I just get a builder to "do it" I'll be paying
OTT for the various trades but am unsure about whether to manage it myself
and bring in the trades as needed.
Has anyone any experience of doing this or any advice?

Dave S