If you go to one of those tags and then to the stats tab, this should show user's the are relatively active answering and asking questions on those tags. However, if you're simply looking to learn new things and pick up what you can, I would really just recommend looking through the questions in the tags you're trying to learn. In doing this you will likely quickly pick up on who some of the "experts" are, and regardless, through the voting system, you should be able to learn things from many of the questions. And it doesn't matter if the person with the highest voted and/or accepted answer on a particular question has a high overall rep, they still can be "trusted" in their answer to that specific questions; at least they roughly have the communities collective approval.
Note, looking through the stats tab of a tag will not tell you if the person has the tag favorited or not, but I believe it gets you to your end goal. This link should get you to list for the