How do you guys do it?

specifically the inner surfaces of the wheel.
paint inside , weather and glue?
glue, paint outside, weather?
paint inside, outside, glue weather?

want to make mine slightly muddy, as january 1945 east prussia

I believe its personal to everyone. I paint and weather wheels off the model, then glue everything together, splash here and there to blend everything together, and that's it. This way i get more control, but i bet that visual result would be the same, if i would swap steps.
My main reason for the way i do it, it minimizes handling of the kit. Painting and weathering hull bottom is straight forward and quick, but if i got to paint rubber tires, or chipping on metal road wheels, it is MUCH easier to do off the kit. Else way, i have handle and manipulate kit for every single road wheel. This way i risk rubbing of weathering/paint job already done, or braking something off.