I drill a fair few holes in copper with a hand-drill. You should be fine, just need a steady hand, and make sure that you clamp the piece securely before you start drilling.
Mark the hole with a centre punch, otherwise with a hand drill, the drill will "walk" across the surface, and the hole will end up being in the wrong place.
Always drill a pilot hole.
Use low revs on the drill, I find that drilling at quite low speed makes the hole cleaner, and cuts faster, also, allows you to control the drill better, to keep it on line.
As with drilling any hole in anything, make sure that the piece is clamped in such a way that you're drilling straight down into it. Then get your eye right over the line of the drill and make sure that its going in straight.
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