depends on what pads your using, ceramic? metalic? etc etc
if your after a good allrounder pad i like the bendix gct's (ceramics) which dont need to be bed in according to bendix, i have still done the usual bed in process a couple of times before and didnt really notice a difference between not running them in and when i fitted a set last weekend in a rush and didnt use a bedding in process
Do you have anti-squeal shims for your calipers? I machined discs and replaced pads in a HT and had terrible squealing problems from the new pads. I tried a few chemical fixes that did not work, and finally found a set of shims in a wreck that fixed the problem. Don't throw your old pads out until you are happy with the new!