Miata Clutch Replacement - Day One

My original estiate of 3 or 4 days to complete this task still feels about right. I read online it could be done in 9 or 10 hours with help. So far I have been working alone so 10 hours seems out of the question.

Today I drained the transmission, dropped the drive shaft and loosened 7 of the 14(?) bell housing bolts. The remaining seven at this point seem like they are unaccessible. I am sure this is not true. Three of the bolts have nuts behind them. I haven't figured out to reach the bolt and the nut at the same time. I think my arms would require multiple elbows.

I think I am about 30% done and I have put about 5.5 hours into it so far.

New tools acquired: 3/8" and 1/2" drive universal joints. 18 mm six-point socket.

I already had two sets of metric sockets. One set is 12-point and the other is an impact set. Neither had a 18 mm socket. Why?