As a lefty, when I reload, I do the following:
1) insert the mag
2) rotate the gun just enough where I can grab the slide with my thumb and operate it, and my other fingers on my support hand are ready to go into the grip
3) release the slide by racking it with my thumb
4) establish the grip
At a TDSA course in Tulsa the instructor, Marshall Luton, made a very good point to me. He said, "If us lefties start making changes to our gun to better suit us, what happens when we NEED a gun and the one we pick up is a right handed gun?" In other words, learn to use the majority functions of stock firearms.. It might save your life..