I thought it was too much hassle, but I tore both times. (Not badly, just average - 2nd degree.) My dr recommended it because she said it's good to prepare yourself for what it will feel like... I don't think you can prepare TBH! It feels very different after you have been in labour for a while and when you've got all those amazing hormones and endorphins floating around.
Your best bet is to practice different positions and get your support person to suggest them to you when you're birthing. Read New Active Birth. (Unfortunately I birthed semi reclined both times. The second time it was because I'd only just arrived at the hospital and the MW told me she'd examine me... But I needed to push before she got the chance to check me, LOL.
Just want to add, I was really freaked out about tearing during my first pregnancy, but in that birth I didn't feel any pain during the crowning at all - just a strange stretchy/stingy feeling. GL for it all!