yeah you'll be able to lift it, but holding it in place when you fit it is very dangerous, get a trolley jack and a piece of wood to raise it into place when fitting. i've had a gearbox roll off the jack and onto my chest, that isnt a good thing at all, so make sure you take your time and do it carefully. if the gearbox has been sat in a scrapyard or off the car for some time its worth flushing it out with some cheap gearbox fluid mixed with engine flush prior to fitting.