I had the ever feared plug leak at one point too. It doesn't take long to make a mess. Don't fear, when the oil gets warm it gets thinner and spreads around easier. Then it does its job, and picks up dirt, all the dirt and debris in the air and from the road as you ride. Then when you shut the bike off it cools and coagulates getting thick again. What your left with is a mess that looks FAR more alarming than what the problem actually presents. As far as my oil leak was concerned, I never had to add oil, it just made a massive mess.
You can do the fix without a torque wrench. I had a torque wrench but couldn't get it on most of the bolts anyway. Most of the bolts are in the ballpark of 12 ft. lbs. That's pretty much hand snug with a ratchet assuming you're not Hulk Hulgan.
Take your time on the fix, and use the print out with a piece of carb board to keep your bolts in order. You can look at the piece of paper and match up where everything goes easy as cake. Clean where the cover goes on very well. When I put the sealant on, I went to a pharmacy (Wal mart of Walgreens work great) and asked for a syringe to apply the sealer. They will give them out for free, get one without the needle. Makes the application much easier.
DON'T FORGET TO PUT THE MESH SCREEN (for the crank case breather) BACK INTO PLACE AND A RUBBER SPACER BEFORE PUTTING THE HEAD COVER BACK ON!
I did this and had to go back to square one.
Good luck and you can do this, I'm a college student and pretty much did it in a barren garage.