Congratulations! The security field is actually pretty good to get into as it is licensed and regulated in most states. I worked closely with Security Alarm companies a few times while I was doing voice and data networking in Texas.
Your profile says that you are located in California, so you might want to read up on CA's licensing requirements that you will want to understand: http://www.bsis.ca.gov/industries_regulated/alarm.shtml
Also, EIA/TIA-862 covers Structured Cabling for Building Control Systems which covers Security and Access Control - here's an article that covers the basics of it and will lead to more linking and Googling on your part: http://www.mohawk-cable.com/support/...a-eia-862.html
. Keep in mind that this is "big picture" stuff that probably won't make much sense to you right now, but will be useful later on.
As for hints, tips, and tricks...every install is going to be different so learn from the guys who have been doing it for a while, don't be afraid to ask questions if you are unsure of your tasks, and don't be a butt-head.
Other than that, have fun! I liked doing Telecom in the construction field and may be returning to it here in Seattle. Security is actually easier, labor-wise; it pays better, and once you are licensed you can negotiate more money