Here's how I do a P2tog tbl... With the yarn in front, I first flip the left needle's left end to the right and away from me so that the back side of the two stitches I need to purl together are facing me. The I run the right hand needle into the 2nd stitch from the needle tip, then 1st stitch, moving the RH needle from right to left. Then move the LH needle back into normal position and complete the P2tog.
I find it easier that way and saves all the fuss of moving stitches around. But whatever works for each person is best for them.