Not a great fan of the Mouse mat configuration myself as it is harder to keep your edge consequent, and the same through the entire process leaving you with a more wobbly edge, plus it always seems to round of the cutting edge, when springing up behind the blade making something that resembles a micro-bevel, but then again there are allot of sharpening methods, and if it works for you that is what we are looking for, I just find that my knives are sharper if I strop them with a Thin piece of leather (prox, 1.5mm) glued to a solid piece of MDF ( wood will move and hydrate etc) with a bit of Ian Longstrider's stropping compound( he is also on this forum, under the name Longstrider)
And to start and regrind I usually start of with some 120, machine grade sandingpaper, as it wont wear down as fast as regular sandpaper, plus it wont clog up, then if I get my desired shape, I go up in the grids from 120, to 320, to 600, to 1200,(water-stones from here) to 2000, to 5000, and then a final strop as descibed above, and when you maintain and use your knives correctly, they usually wont need anything more then a strop every now and then.
But then again there are many ways of doing it, one pointer though, dont be tempted to take your expensive tools to the grinder or belt sander, it will over heat your metal,which will mess up your heat treatment, and heat treatment is the most important piece in making a good knife.
Hope that helps, and no puns intended or offense implied, just trying to contribute
Yours sincerely Ruud
