Sorry, Never done one before that is why I am so many questions. A customer of mine said I can practice on his so thats how I will start. Will get the 3.3M one first and just try with fairy. Should give me an idea on time so how much I should charge. Suppose I will not know until I try.
I expect it is just like cleaning the windows in that you get a better judge of pricing with experience. I know I made some right gaffs when I first started.