Hi,
yes of course, but no such thing as a quick or short explanation if you contemplate to overhaul a Giss type Diana.
There are quite a few things to cover and explain to someone who has never had one apart, so an explanation ends up being a bit longer than explaining that of an ordinary springer's overhaul. I was like you a few years ago and now I know what makes these airguns such a joy to shoot and you just have to admire their mechanical genius. All you need is patience, a fair bit of mechanical aptitude and not rush through the process.
I can send you a rather long e mail detailing how I go about an overhaul of the Giss system and some pictures if you wish.
D