In reply to snaresman: It sounds like you have the right attitude. If you are cautious enough to check you are not being reckless before you start, you are probably going to be cautious generally when doing it and that probably means you will be safe.
A few basic rules kept in mind will prevent disaster, for example
-Always make sure both people are attached to the system at all times
-As was mentioned above consider the direction of forces caused by both a leader fall and a second's slip.Alongside this consider the belayers position and orientation.
- When leading off a stance (rather than off the ground) always put a runner in ASAP to protect the belay (by preventing a factor two fall).
As long as you are, as you said, well within your grade and sensible as to the locations and style of route you choose, you will be fine. You may be slow to start with and you will no doubt get yourselves into tangles at times but you will have fun and learn a lot by teaching someone else what you know.
HTH