I also have the BH Disco 2200. I too being a noob needed time to get the feel of it all. However I have to agree you may find that in pinpointing you target it seems to be a little off from where you may think it is. A true pinpointer unit maybe very helpful. I also found that I will get a beep on my sweep on the right side. Could be from the coil cable hitting against the coil pole. If I sweep slower it stops. The depth I have to still get a better feel for. I will be trying Postal Two's method and post my findings.

A second note: After having this unit for 3 months and almost 10 hunts, I had to return it to FTP for repairs. It started acting weird, with unexplained beeps/detectings, tried shutting down the unit, but it would not turn off, although readout display was faded. Eventually, it shut off when I pulled the batteries. When replacing them with fresh ones unit no longer turned on. Any input on this would be grateful.
Despite the malfunction, I was really liking the unit as my first MDor.
In the future, keep a close eye on that push on connector. They can (and often DO) get loose and/or dirty and can definitely make the unit go completely crazy if you don't have a good, solid connection. You'll get strong signals and wind up digging targets when there's nothing in the hole at all. It happened to me with my BH Pioneer 202.
It was so bad that was ready to trash that machine but a fellow T'Net member suggested I check out that connector. I took it apart and there was dirt packed in there. It was also kinda' loose. I cleaned it with electrical contact cleaner and a soft rag then re seated the connector with the plug IN to keep it well centered while SNUGGING up the screws. Be sure you don't over tighten those little screws because you can break the plastic. After that easy fix it was like new again.
I also taped up the battery wires with black electrical tape. I never liked the way they just flop around in there. I taped both wires together on each side and made it nice and neat. It also improved the overall performance. Also, be VERY careful removing the batteries. You can pull those wires right out if you're not careful. ALWAYS hold the battery and gently disconnect the terminals when you're switching them out.
I don't use that machine anymore but it still works just fine. I found one of my oldest coins with it.
The older style BH machines are not depth monsters but they'll definitely locate treasure. They are also FANTASTIC machines to learn on. I used three different BH's and found treasure with all of them; not to mention tons of trash but that's a given in this hobby; especially if you're hunting for gold. The main reason I upgraded is because I always had that nagging, gut feeling that I was leaving treasure behind.
That did turn out to be true when I went back to the same sites with my Delta. I had been passing right over some deeper targets and many coins that were sideways in the ground with the BH. It just wasn't seeing them. It's just not designed to hit really deep but it did a pretty good job overall with the more shallow targets. Also, once in a while it may surprise you. If the conditions are just right they sometimes will pick up deeper targets but not always consistently. For the money they will do the job and again, you'll learn a great deal about this hobby.
Good luck with it. If you become a true believer/addict you'll know when you've outgrown your current BH detector and are ready for an upgrade. Plus you'll still have a decent backup unit for a friend or whatever.
Oh yeah, a pinpointer is definitely a HUGE help. Don't waste your money on a cheapy if you don't have to. Trust me. I started out with a modified Cen-Tech hand held unit from Harbor Freight. I have to admit it worked and still does after my modifications. It was definitely worth the whopping 17 bucks I shelled out for it and is a great second unit for when I take some kids hunting but it's not a good, solid pinpointer for the long term.
But, since upgrading to a Deteknix XPointer, I would never be without a solid pinpointer on a hunt. I highly recommend it. It will NEVER false, works extremely well and costs about 40 bucks less than the Garrett Pro Pointer. Oh, and the Garrett is also an excellent pinpointer. The important thing is to get the equipment that suits YOU and your individual hunting style.
Good Luck & HH....