If your bodykit is brand new and doesn't need repairing.. I'd try DIY first lol.
Like you said, whats the worst that can happen? If you try DIY for the whole kit & spoiler for $100, if you stuff up, you've learnt a $100 lesson, but if you like the quality, you save $900
I DIY my front bar and I'm pretty happy with it, $80 (include ALL the materials) compare to $300.