Well, no guarantees on not losing a stitch with any method, but...
You can either run a piece of waste yarn or crochet cotton (on a yarn needle) through all stitches on a row you know is right and then rip back to there. The waste yarn/crochet thread will hold that row of stitches and stop you from going too far. Then just pick up all the stitches one by one and start knitting again (you can pull out the waste yarn or leave it, if you think you may want/need to return to there!). Or, you can just rip down to the row you need to get to, then when you get there, take the stitches out one by one before or after inserting your needle into the loop you need. Whatever you do, make sure as you start knitting your stitches that they are oriented properly or fix them as you go.
There's a knitty pictorial here
that might help.