Calibrating Canon T1i and 50 mm f1.4 USM lens?

Basically i want to calibrate my camera with all my lenses... My pics while zooming to actual size are blurry, though on camera LCD they look decent. I tried sending lens to Canon, they sent me back "already adjusted", I explained that to their technician that problem persists and she asked to send lens with body. I don't want to use extravagant methods that take lots of time and money, though i could send my camera and lenses for free to Canon Service Center... somebody said there is a way to do calibration at home. Please help me, because sending it to Canon is also tricky (can be damaged by UPS) and timely (i always keep shooting).