i think the tricks to price stuff with plenty of extra headroom and as someone said be very clear and communication wise you need to repeat yourself , phone before , again and revisit....mis communication is one problem and yeah the odd person trying it on .When i price i tell them i will revisit for any ammendments now prior to the job and i also state clearly what its for and i find that tends to put the wankers off , they tend to give themselves away anyway trying to work out work your hourly rate will equate to via the price work and a lot of other traits they have , you can spot a non payer a mile away and also a time waster and also a ' can you plaster my hallway while your here ' for free.....i sadly never got ' can you bend me over in the bedroom for free ? ' ....though i am ' happily married '
so would never want that situation to occur .