In lack of a team, you'll have to limit yourself at the speed of your questing
. I must say here that no matter how many toons you leveled, there still are quests that you don't know about or you'll forget about, in time. That's exactly why I use a WoW leveling guide, even if I've been around since beta. My quest path is continuously improving and my last record is 7 days and 18 hours for a level 80.