Look at Matt's DIY website
Don't worry he'll pop up here anytime now and give you the link.
Very helpful, you can familiarise yourself a bit with the principles, he takes you through a nice step by step guide of how to go wfp the DIY way.
WFP is not the best thing since sliced bread, but at the very least it is less risky than climbing a ladder.
The debates about which method is best will continue till Halley's comet comes back into sight!
I have been cleaning windows 18 years, using wfp for 3 months!
I won't be returning to the old method.
Pj