All nuts & bolts and a relatively simple 1-person job (I did mine manually without the use of an engine hoist last time, not something to consider doing if you have a hoist handy but I didn't and just got on with it and didn't have any problems).
With the gearbox out you really ought to consider a clutch kit and rear crankshaft oil-seal, so simple while it is all dismantled but a real pain if you have to do it all again in the near future because one of them fails.