If you have to stop on an uphill, getting started can be rough. One of my friends shifts up a couple gears in the back while she's off the bike, picks up the back end and spins the pedals to move the chain to the new gear. This gives her a little more oomph to start pedaling. I situate my bike where I can keep a tiptoe on the ground, put some weight on my saddle, and start peddling with my other foot. There's a trick to it.