DEI Viper 791VX RS harness questions

I am going to attempt to install my very first ever car alarm on my 98 Ford F-150, and I have a few questions.  Any help would be appreciated.  Thanks in advance.

(1) I have a "Remote Start Primary Harness, 7-pin connector" with the following notation:

          1 -- pink/white -- 200mA (-) Programmable IGN2/ACC2 Relay turn on

          2 -- yellow -- (+) IGNITION input to alarm

          3 -- Pink -- (-) 200mA IGNITION Relay turn-on

          4 -- Orange -- (-) 200mA ACCESSORY relay turn-on

          5 -- Purple -- (-) 200mA STARTER relay turn-on

          6 -- ORANGE / black -- (-) antigrind/ground when armed output

          7 -- Blue -- (-) 200mA STATUS output

(2) I also have a "heavy gauge inline connector relay key switch interface" harness with the following notation:

          1 -- Purple -- (+) output to STARTER circuit (starter side)

          2 -- Green -- Onboard STARTER KILL (key side)

          3 -- Red -- (+) high current 12V input

          4 -- Orange -- (+) output to ACCESSORY circuit

          5 -- Pink -- (+) output to PRIMARY IGNITION circuit

          6 -- Red -- (+) high current 12V input

          7 -- Pink/white -- (+) output to SECOND IGNITION circuit

          8 -- RED / white -- (+) high current 12V input

My question is this:

I've read on here that since my vehicle has 3 ignition wires and 2 accessory wires that I would need to add extra relays from the alarm/remote start to accomodate this; however, if I'm using relays to obtain the extra capacity I need for the ignition and accessory circuits, which of those 2 harnesses do I put those relays off of?  The first one I listed says "relay turn on" for most of its outputs, but the second one is the "relay key switch interface", so which do I use?  And what do I use the other harness for, and please be as detailed as possible?

Also, since you add the relays for the extra vehicle ignition wires off the remote start IGN2 wire, do you need a relay for the primary ignition? or does the vehicle already have one that is being activated for that circuit?

I'm also assuming that I just splice into the vehicle wiring, rather than just completely disconnecting the vehicle wiring from it's sources, correct? except for the door lock relays since I have to use the 5 wire method, so I have to insert the relays between the switch and the motor, right?

I know those questions probably make me sound like a complete moron, but I've just never done any of this before and I can't afford to pay someone else to install it for me right now.  Any help/advice would be very much appreciated.  Thanks.

-Adam