Time served Motor mechanic by trade who moved into the Oil Industry after my time was out.

It's not hard, basically got a copy of the current building regs and followed them to the letter.

Didn't take ANY short cuts and bought the best materials i could get.

It's not hard, i spent alot of time making sure i had EVERYTHING square'd corner to corner and it came together quite well.

If i wasnt sure on something id ask a friend who was in that particular trade. Theres no such thing as a stupid question but the consequences of not asking can be costly.

Building inspector came and issued the Completion Certificate without any fixes so i was happy

I still firmly beleive that it's each to their own and if there is any doubt about whether you can manage or not then get a professional in.