Don't stress out too much about it. A lot of the time they will fast all on their own if they are getting too chunky. If they don't, and start getting a bit round, it's easy to correct if you don't just continue to overfeed once you notice it.
Another thing besides the shape of the snake you can watch for (often shows more immediately too) is the waste, but it requires a bit of time getting used to what the baseline should be. I know it's time to back off on feeding a bit with my females during follicle development (they eat really heavy towards the beginning and then need to slow down during the latter part) when I start getting really large and smelly poop from them. When they are eating the correct amount, it's just compact and well digested little turds. When it's too much, they will "blow up" a whole corner of the enclosure with something that looks like it came out of a rottweiler.
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