As written above taking it off is a snap.........actualy about 5......
but putting it back on with out bending the sr headliner out of shape takes skills.
It could be a good idea to try snapping it on prior to putting the roof back in the tracks.
FWIW..I was at a very skilled MB tech today who has transplanted engines, transmissions, and any and all other parts of a car. When I asked him if he would check why my sunroof gets stuck slightly closing, he said "We don't touch sunroofs."
There is a reason for this which all who mess with sunroofs learn quickly.
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