Is it possible to mine DGB from my gaming desktop, or would that not be worth my time? If so, how would I go about doing that?
Yes it's possible to mine from your computer. One option is using the digihash miner, go to
this webpage and read #3.
If you think the price will significantly increase, then it would be worth your time.
In the here and now, you'll spend more for the electricity to run your computer than you will make back in DGB.