I have removed the gearbox in the past on its own, and with the engine. I would say that it really depends on where you are going to work, and what facilities you have available.
The first time i have rented an engine hoist, and pulled the gearbox along with the engine, at home, in my parking space, working alone. I can say that it was relatively easy, but i had to disconnect a few more things.
The second time i pulled the gearbox only, and i also did it alone, at home, in my parking space, with the car supported on stands. This meant that the working height was marginal, and i had to support the weight of the gearbox with my hands in order to pull it out, or align it and put it back in, while i was lying on my back. Mind you, the available space is marginal at best, and depending on the various tolerances of the base unit, it could be a little easier, or rather more difficult. If you feel that you are fit enough for this, go ahead. As others said before, you have to tilt the engine back as far as it will go (for your LHD car the limit will be the rear carb hitting the brake fluid reservoir), and as soon as you take off all of the bellhousing bolts, you will have to rotate the gearbox in order to have the starter motor hump at the top. As you are pulling it out, you will find that the bellhousing hits the transmission tunnel on the driver's side (for a LHD car). As the saying goes reffiting is the reverse of the removal procedure, with the added difficulty that you have to align the input shaft with the clutch, while trying to maneuvre the bellhousing past the edge of the tunnel, and of course not allowing the input shaft to take any weight. Good luck with that!
Of course if the car is over a pit or on a lift, and you have availble someone else to help, it will be significantly more easier.