remote starter install 2000 chev. malibu

I bought a Viper remote starter for my wife for Christmas and intended to install the unit myself in her Chevy Malibu.  I'm comfortable with car electronics (done my share of stereo installs) and restored to old cars including rewiring everything, so I was confident I could handle the project.  The install guide was a little intimidating so I decided to call best buy (where the kit came from) and they told me installation would be $150.  $50 for labor, $50 for a modulator to bypass the ignition's security features (chip in the key) and $45 for 3 extra relays not included in the kit.  Sorry for all the background but I didn't think an answer would be possible without it.  Is there away around these extra bypass/modulator? (the relays I have extras so I'm not worried about them) and more importantly, can I do this install myself or is this something beyond my skill level?  Last question, is $150 a fair price for the install? - it seemed high from what I had heard - of course I wasn't thinking in terms of $100 in extra parts.  I live in NJ in case the prices very in different areas.

Thanks

-Dave

Instead of using the 555L or 556U, use a relay and a resistor. If you need a walk through let me know.  $150 is a fair price considering you could get a lifetime warrenty on the install.