Tank Removal and Front Cover Removal
I find the Haynes manual in conjunction with the BMW service/maintenance CD is a good way of getting things done. The Haynes manual will show things that are not shown on the CD, and vice versa, but I have found that together they work very well.
Removing the tank is fairly straight forward, although I always live in fear of stripping the threads in the captive nuts holding the filler/top panel to the tank. I usually chicken out when tightening these and do them finger tight and have my nearest dealer check them (they're something like 2Nm). I now leave the top panel attached to the tank when I take the tank off, and avoid touching the screws. And be careful not to drop the aluminium side/knee panels, keep a tight hold of them when you pop them off. They're anodised and damage easily.
The timing cover on the front of the engine is a bit more involved, but I did change it over myself using the Haynes manual and BMW CD. This definately was a case that each showed information that the other didn't. I didn't bother trying to match the colour with the engine because I assumed I would never get it quite right, so I had the new one blasted, alocromed, and then powder coated matt black to create a contrast. I'm happy with it, but as with all these things, it may not suit everyone. I did need to gather up quite a few tools for this job, some I had made (diagrams in the Haynes manual) and some I bought from BMW. It took the best part of a day to do this, but there was a bit of a learning curve, and it would be a lot quicker if I were to do the job again.
Good luck, and hope this helps.