I would advise you go for a vanmount if at all possible,with just a delivery system you`ll only need a pump,tank,resin cannister + poles,then make water at home.A tip for you,don`t go overboard on cleaning the frames for everyone they don`t get it for free now so why should they get it for free then.I do the frames completly on the top payers other than that it`s extra,practise on family freinds your own house ect untill your happy that you can do a good job with it,some window`s just don`t like the pole this just has to be excepted oxidized paint work is a nightmare and the results can be rubbish,then you can go down the road and do the same type of window`s with good maintained frames and the results are perfect.All houses are different and you`ll get to know the ones that will play up,you might want to go back to laddering them or you might want to pass them on.These days my ladders are getting used less and less by the week,there starting to go green LOL.