If you want to step through from the beginning, just put your cursor in the procedure and press F8. It steps through right from the start. If you find the place that is messing things up, just click the Stop button on the Debug toolbar (I always have it displayed). In other words, if you are stepping through, you do not have to go to the end, you can stop it any time you want.
Of course if you know the "first" part - whatever that may be - is correct, and you want to step-through starting at a particular spot, then follow HQ's suggestion and use a breakpoint.
Depending on what you are needing, then absolutely, using Watches is a very good idea.
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Gerry