Thanks! There is only so much to tell, really. It's actually pretty simple. I mean, if I can do it...

You want to make sure you have something heavy and flat under the enclose - directly under the wall that gets stamped. Otherwise the whole thing gets bent badly (a mistake I made when I first tried stamping - on my test enclosure lid). I was lucky to be able to get a piece of stainless steel cut to my custom dimensions in the company where I work. I made it 30x50x80 mm so that it is suitable for 1590a, b and bb.
I am yet to find the best surface to work on. My first guess was that it has to be something heavy and stable under that piece of steel. I used the concrete floor on my balcony but there was a lot of recoil. Maybe something a bit more ductile will work better. But it still has to be stable - a jumpy table will not be a good option I guess. For the same reason they say it's best to use a brass hammer as it reduces recoil. I used a 450g steel hammer. Too small/lightweight hammer will not work very well, obviously.
I didn't manage to make each imprint with just one good hit - took me 4-6 for each letter. It's actually not too hard to keep the stamp in position once you have at least a shallow imprint after the first hit – just have to make sure it locked in the previous imprint before hitting again. I obviously did not do that well enough when I was doing the first С.
I started with the knob names. I knew each one was going to be three letters long so I started with the center letter and the moved outwards from there. The same with СВЕВЕР except that it has an even number of letters, so I positioned the two center letters accordingly. I did not do any real planning before I started – did not draw or tape any lines or individual letter positions. Maybe I will try that next time.