Hi Pablo,
When I first started I had a quick cleaning lesson from a friend who also cleans locally.
But I decided to go on this course before staring out, to see what other possible tips and advice I could pick up.
I didn't realise there where so many things to think about, whether it be safety issues, choosing the right tools for the job, and obviously window cleaning techniques. I am pretty certain had I not gone on this course, I would not have picked up this techniques for quite some time. The techniques that I was taught, were nothing like that of my freind, and he'd been cleaning for about 5 years.
I'm not saying by any stretch of the imagination that you could not start out without doing this course. But, if you are new to this, then you will save yourself one hell of lot of time through not making mistakes that I'm sure a lot of us have made when first started out.
As far as ladder work goes, you are given advice on using ladders safely, but no actual practical ladder work takes place. You could ask tham of course, but I'm pretty sure that there is an insurance issue with that!
I hope that helps you make an informed decision.
Simon