Going to install an alarm tomorrow any tips before I start
 

I have a 96 civic EX and have an alarm that has siren, keyless entry, and disable engine. I will also post the wireing diagram for the alarm, I got the civic diagram off the12volt.com. Also I wanted to install a killswitch while I am down there any tips on what I need to get started?

Oh almost forgot, I read that I may need to get a relay since the keyless is reverse polarity, any confirmation on that and if so what part number do I need?