the 6 p rule. proper planning prevents **** poor practice
always supply your own materials
never ever cut round a sink or toilet. looks disgusting. even if the customer asks for it, just take the sanitary ware out and do it properly.
no mates rates for anyone. my mum pays full whack for any work.
no haggling. if i could do it cheaper then i would, so dont ask.
no matter how easy they say the job is on the phone, it probably isnt, so no quotes without first seeing the job.
diy store tiles (b&q, homebase, focus, etc) are likely to be useless, so don't buy them.
never use all in one adhesive and grout.
always do the work to a standard you would accept in your home.
always be nice and polite no matter how much the customer is being a nightmare