Originally Posted by
EpicSchwinn
If you don't have a torque wrench I'd recommend having the bike shop at least double check if your cranks are tight enough. They can be damaged if they're not torqued down enough. Also, make sure your headset is tightened properly. I'm not an expert on this and maybe someone else can chime in on the steps for this.
You don't need a torque wrench if you have common sense and a general understanding of the material properties of the components you are workign with. I've never bothered with a torque wrench, not even with carbon, and have never f'ed anything up.