For the benefit of Mr Cynical I have already successfully:
Calculated the BTU requirements of each room,
Fitted all central heating pipework
Fitted all rads and TRVs
and pressure tested the system.
Not being cynical mate, just kidding; it was more directed at the resident posters managing 3 pages out of: "What is this bit of metal?"
it's amazing what you can acheive from books, advice from mates in the trade and sites like this (most of time).
Very true. In fact, if the advice is good, and people are clever enough to follow the advice to the letter and not fall for the temptation to take shortcuts because it is easier/quicker, it is likely that they end up with a better result than most people have from work that was done by pro's who were in a hurry.
As for taking the pi55 on the forum, bar the odd troll (which is bound to get an earfull from the regulars anyway), it is all done for a laugh and not to be taken seriously or personally.
The amount of
'ses posted by the regulars far outweighs those of the "amateurs"; my own score is pretty good.
I got the same reception in the electrics forum on this site when I told them I was doing my own complete rewire. Half the people took the p**s knowing nothing about my ability, saying I couldn't/shouldn't do it;
Especially with electrics, there is nothing against doing it all by yourself, only leaving the testing to the pro. As long as there are no invisible junction boxes, everything is inspectable and measurable, and any imperfection will show up clear as a bell.
Gas is slightly different as you can not test the quality of the joints, but there is nothing wrong with you hanging all the rads, piping them up and drilling the hole for the flue. I have done a number or projects exactly like that where I only did the gaspipe and the installation of the actual boiler and flue, and they all work like a dream.