There are two ways to do this; using a recoil start or electric start. Recoil starts are more efficient than they used to be. Simply tug the cord, and the engine kicks into life. Ensure the choke is open, especially on the coldest days, as this allows more gas through to aid a cold start.
Some models have an electric start, which takes the hassle out of pulling a recoil cord. Simply plug in the blower to an electrical socket and press the button, and the engine fires into life. Now you can remove the plug and get clearing.
Some models have an onboard battery to aid this but remember that batteries don’t like the cold, so you might not have enough juice in the cell to get it started.
Electric models are the easiest because all they need is a plug socket, and away you go.