Entry Alarm

What do I need to get an alarm and keyless entry for my truck?
I have a 98 chevy 1500 and I want to install an alarm and keyless entry to it, Do I need anything special to install it. and about how much it would cost to have a mehanic to install for me?
There are kits to do that on Ebay reasonable price.The an alarm input is a fairly simple project.The keyless afternoon could be a big problem because the cables needed for doors.Someone familiar with this type of work could charge about $ 200 as a guess. Ebay: Item number: 380175074128
Remote Start, Keyless Entry, Alarm from Viper