Warning: before you disassemble, be aware that it can be a real bugger to get the springs right when you re-assemble so that the popup binding works.
Undo the bolts on the black bits at the ends of the cage, and the wee screw on the crank end. The red bits then pull off. The underlying SPD is just like an old PD-M535 (I think…). Pull off the plastic end-cap. You can use a socket and something very thin (like a screwdriver) to undo the axle bolts to get to the bearings. The bearings are tiny. It’s a fiddly process!
Good thing about the C2C route I did was there were YHs conveniently placed along the way, so I got by with a seatpost rack (drybag lashed on) and a small rucsac. Mileage was 60/60/50/70 the way I did it.
Tim Woodcock Scottish C2C ride is excellent – 7 days in the book (it came free with MTB Pro years ago!), but do-able in 4. Train access to start and at finish.
Corrieyairack, Rothiemurchus, Braemar, Mt Keen all included :)
Wear a hat or a buff? I agree with gingerflash – I find that once the rest of my body is warmed up, my hands warm up quite quickly and I don’t need such thick gloves.
