Custy asked me to if I could change a leaking gutter connecter , no problem I said
Went to b&q , bought a white square connecter , tried to fit it . . . . no it wouldnt fit ! went back to b&q with original fitting . It is 114 mm , and guess what nobody uses this size anymore ! so custy has a gap in her guttering , and its gonna cost her a few quid to change over to 112mm . Anyway I rang her to explain it was gonna cost her about £150 for me to do the work , and she replied " Thought you said it was a straightforward job " ! Why do I try and do favours for people ? 
Answer is dont touch guttering if you dont know what you are on about, messit up it could cost you thousands to put right.
I did one today and gutters have been put up by an idiot that does not know about levels, I did the gutter clean when it rains again I will get a call to fix the problem. I am insured to do this as I am not that stupid to do things I am not insured for, and gutters are the one of the worst things to cock up if you dont know what you are doing.
Be carful is what I am saying I am not having a dig or I would come straight out with it.
It can cost a lot.
Ian