Best advice I can give is summed up in a few lines.
1. Don't be too hard on yourself.
2. Keep it fun and keep it light, but do take it seriously. These are difficult skills you're undertaking and not to be entered into too lightly.
3. Practice every day. Not play every day - practice. There's a difference. Up front, it's hard to do when all you want to do is jamm.
4. Work the songs in early. Use songs you like, but don't try and sound like a whole band of professional musicians. Do easy arrangements, even if it's just one single down strum (on time) per beat. Just remember, every single guitarist you hear on the radio once picked up a guitar for the first time too. And I guarantee you that every single one of them had a hard time getting the "D" chord at first, and then later had to work their fingers to the bone to get barre chords and arpeggios to come out smooth. Every one of them. You'll be no exception. Don't let it bring you down. (I'm listening to Neil Young and couldn't resist)
5. If there's something you don't understand, come on back to Chordie and ask. But don't be surprised if you get 75 different answers and that they're all correct even if they say exactly opposite things. Music can be like that. It's why we call people "cats" and seem befuddled most of the time.
Congratulations on deciding to play guitar. Thank your friends for us too, because I'm already looking forward to when you're willing share advice with us and listening to your songs.
Granted B chord amnesty by King of the Mutants (Long live the king).
If it comes from the heart and you add a few beers... it'll be awesome! - Mekidsmom
When in doubt ... hats. - B.G. Dude