Help knitting a sock?

I began knitting a Christmas Stocking for my daughter and I am having trouble with the heel flap. Well getting all the stitches onto one needle to make the heel flap. I am working with 4 dpn. And the instructions tell me to Slip the last 15 sts from 3rd needle and first 15 from 1st needle onto 1 needle for heel. I... show more I began knitting a Christmas Stocking for my daughter and I am having trouble with the heel flap. Well getting all the stitches onto one needle to make the heel flap. I am working with 4 dpn. And the instructions tell me to Slip the last 15 sts from 3rd needle and first 15 from 1st needle onto 1 needle for heel. I understand slipping the needles to a new needle, but if I do it the way stated won't the yarn I am knitting with end up in the middle of my stitches? Or am I numbering my needles wrong? Sorry, but I am still new at knitting socks and things. This is my first attempt. Please help. Thanks!
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