I have replaced both rear mount and gearbox end mounts , can be fiddly, a trolley jack would help, i did not remove the 2 bolts on the bracket when i replaced the rear mount, i think doing this will make it much easier to do so it may be the way to go, good luck. ps it's worth checking the condition of the gearbox mount it may be split(this is located just above the nearside wheel within the wheel arch), mine was split but the rear mount was fine.