Using a power drill is certainly easier than trying to drill by hand (and who does that anymore?), but the power cord can be awkward if it's stretched across the garage or into the backyard. Instead, try a rechargeable drill. A rechargeable drill frees you from the annoying cord and packs a lot of power while using far less energy.
You can find kits complete with plenty of bits, and some even come with two interchangeable rechargeable batteries so you won't run out of juice mid-job. To get the longest use, look for higher battery amp-hours (Ah). Higher Ah allows you to get in more hours of use between charges.