When I first started to teach I had a tendency to overreach in my lesson planning. I'd try to do too much in too short a period of time. I had an easy way with my students and tended to be very accommodating so that never got me into trouble when I goofed up with timing. But when I started to use technology in my classes, because I was very much a novice with the computer, I was not prone to over-reaching at all. I learned an important lesson about using technology though. You have to start small, make it simple, don't try accomplish too much because problems will arise and they will through you off your game in front of the students. Don't try to make it too difficult for you OR for your students and then add to your repertoire as they and you begin to gain confidence and efficacy.