Gazza
Buy one and buy the unger angle adaptor, this will make it eisier to use, you can continue to use it even when you do go wfp.
I'm no exception to the rule I just have nine years experience in its use, I can clean my own upstairs widows from the ground and do a good Job, Practice practice and practice again, and use your own windows to practice on. if you don't have a conservatorie use you family's or friends.
Use loads of water on your applicator (dripping wet) give the window a good wash and then use your blade to remove all the water then get a unger quike grip then detail.
I Must admit I have never used the quike grip, I just put my scrim on the end of my pole to detail.