Not as bad i thought it was going to be. And as you progress with trials you'll realise bleeding as magura in a bath (or bucket) of water does pretty much the same thing Welcome to the forum
You should start 'em as young as possible in my opinion, Like when other parents are teaching there children to score goals you can be teaching him/her how to wheelie
Why? Well because i was using black pads on a grind for about 2 days backwheeled a wall and smashed my back on the top of it, Because there such a soft compound. Pads like Koxx bloxx browns will do you well.
If your going to grind your rim, And have magura black pads you may want to start looking for some different pads. You shouldn't apply more force than the angle grinder itself usually anyway.
• For Sale/Wanted/Swap threads are not allowed in New Members Chat So STFU! Start writing properly and maybe, Just maybe you will be able to buy from this forum one day.