Apart from either dropping the gearbox, or removing the engine, the job is a piece of p*iss.
I did mine not so long back, and having read the sections in the "Haynes book of wishful thinking" and asking on here, engine out was the easiest solution.
I had engine out, seal swapped, new clutch just for good measure while it was out, and all back together and running in a less than a weekend on my drive.
Engine hoist is only bit of 'specialised' equipment needed, but you will need it wether you pull the engine OR drop the box.