Even with the doors getting into the front cockpit is not easy:
Place the right foot on to the black reinforced board on the lower wing.
Put your left hand into the grip in front of the rear screen, just inside the front cockpit.
Pull yourself up, put left leg onto seat and with right hand grip the right centre section strut.
Pull other leg into the cockpit and stand on the seat.
Holding both centre section struts move feet from the seat onto the floor, most of your weight will be taken by your hands/arms
Lower yourself into the seat, taking care to avoid sitting on the rear screen.
Strap in, close the doors.
Getting out is largely the reverse, you have to pull yourself out using your arms...
I was 3 years old for my first flight in a Tiger Moth including a loop with my late father and they had to pad the seat out with cushions to make the straps fit.
I lost count of the hours I sat in one either dual or solo but never recall it being a difficulty a bit like the Morgan an instinctive job. It's all in my fathers or my log books somewhere together with the different types flown.