Also, I hate to say it but it truely is a numbers game. The more you contact the more chances you have of landing one. With big stuff all you need is a few.
Ya really gotta nail down your pitch too.
You only have one chance to make it so do it right the first time. Try to get the person on the other line taking about something they're interested in. Get them into a happy state of mind and if you can get them saying yes it's a plus.