It depends - from the factory, the timing cover is fitted with two studs that prevent you from easily removing the timing cover. Many people replace these studs with machine screws (bolts) which means they're much easier to remove. The downside of bolts is that you can grossly overtighten them and destroy a gasket.
If you still have studs, don't worry, you only need to lower the sump enough to get them clear to pull the timing cover off. with a Jack, a set of axle stands, a couple of socket sets with extenders and universal joints you can drop the sump enough.
Basically, put your car up on the axle stands, put the jack underneath the gearbox, undo your engine mounts and jack the gearbox and motor up. You need to play with the heights a little depending which sump nuts you undo, some are easier if it's lower, some are easier if it's higher.
Also, take the engine mounts off completely, it's not difficult to do and will give you much more room.
A socket with extender is easy, a 3/8 drive is idea, I have a 1/2 drive and it's too big to do the back nuts and a couple over the crossmember with a uni on it.
You can actually remove a sump with the motor in the car, it's tricky but I've done it plenty of times.
BUT - be warned, the hardest bit is bolting the sump back in properly. I'd put in a new gasket as a must and DO NOT use silicon. Permatex No 5 non hardening gasket is the ducks nuts for sealing a sump and don't tightent it very much.