Presuming it is the front cover, it is not that bad. Worst part is going to be getting the front pulley off. It is either going to slide off, or fight all the way. Never had one meet me half way. Water pump and idler pulley are just a couple of bolts.
If it is the back side - READ the timing gear housing, then yeah, that sucks.
If you can read instructions, have a few basic tools, and minimal skill, you can DIY.
First off, where exactly is the leak? Top, bottom... . ? If it is in the angle on the drivers side of the engine directly across (towards the passenger side) from the crank breather, you may have a dowel pin issue happening.
The first thing I would do is pull the serpentine belt, get a torque wrench, and re-torque all the bolts to spec (18 ft #). It may or may not cure your ills. Not exactly the proper way to do it, but I have about 5 trucks and 3 pieces of heavy equipment at work that had big time oil leaks that just needed the bolts re-torqued. Over a year on a couple and still dry as a bone.
If you do have to replace the gasket, you will need a new front main seal, that can be a PITA to do, and if you don't have the proper tools, you may want to take it (just the cover) to a shop and have them do it.