Welcome from Maryland! Like you, I am self-taught. I learned a little from a book but mostly from trial and error. I say don't stress about the seams; if they're a problem in the block you're working on you're going to see it, and see why, and all this stuff about pressing your seams will suddenly "click" and you'll be able to fix it. I think that's the best way to learn sometimes.
Read all you can, watch all the tutorials you can, but don't forget to sit down and just do it Even the things you try that don't work are invaluable experiences - ask me how I know. ;)
You can do it!