Hello, new here

Wondering if anyone can help me please (did a search but couldn't get a matching answer). The cover of my near side wing mirror came off. Went to Vauxhall and i had to buy a whole mirror housing because the clips on mine had broken off with the cover.

The new housing comes with the plastic bit, cover & a metal holding that shelters the mirror, but no mirror and motor. I have been able to remove my current mirror housing however I haven't been able to remove the mirror and motor so i could transfer them to the new housing. The screws for the mirror seem to be in an awkward position where you'd need a screwdriver with an L shape or something like that. Is this the only way to get the mirror and motor out or am I missing something here? thanks

55 plate, 5 Door Astra SXi MK5