| Numpty metalwork question
I was the kid from the council estate who went up to the 'posh' grammar school where we conjugated Latin verbs instead of doing metalwork (the nearest we got was woodwork - where I made my mum a coat rack).
As a result I now find myself, decades later, needing to put some threaded holes in some metalwork and I realise that I have no idea how to do it properly. I only have one shot at this so it needs to be right (although I might practise a bit first).
Now I presume that all I need to do is go out and buy the appropriate sized tap, drill a hole then screw the tap into it, but how do I get it the right size? I presume the hole I drill has to be slightly undersized? But by how much? Does the tap need lubrication? Does it sir, does it? oooh suit you sir. How much force should I use? Do I just wind the little bugga in or is it easy to snap the thing off...
Told you it was a numpty question | 
Jools
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