Stuey - all these jobs are not hard to do at all - its more about taking your time , planning, and hunting around for bargains - avoid places like B&Q etc go to trades places - theres that one across from the old B&Q is'nt there next to petrol station - cant think of the name at the mo - ask in there and they would be happpy to recommend someone for you.
If you need to borrow a cement mixer I have one - but I am doing my mums patio at the mo - well I was till I got a Zed - so on the look out for a van again to get the stuff in the back
If you want I am happy to pop over one night after work and give you an idea of what can and cannot be done and rough costs (Not a builder myself but done 3 houses over last 15 years or so!!) but at least you know what to expect and maybe some stuff I can help you with - in return for a cup of coffee!!
I also can get glass units and double glazed units trade if you need any - I do Stained glass windows as a side line (more relaxation that business)
Up to you anyway PM me and we can take it from there?