Welcome to the scene. I see a lot of criticism here and I'm glad you aren't effected by it. Do what you want to do with YOUR truck. As long as you like it, is all that really matters.
Having said that, I have Rattle Canned my truck numerous times in the 10 years I've had it, back in HS I even painted a Huge Aquabat on the hood. (it was a band I followed for a while around the SoCal O.C. area) I got a lot of shit for it because of what it was, but I took my time on it and did it right. I LOVED IT!
On to what I came here for. Make sure when you do paint the truck properly you take shit off and mask everything up. all you really need to do is scuff up the paint/whatever you are painting with a scotch brite pad (brillo pad) make sure you brillo off the old rattle can if you didn't prep the original paint first, and stay out of the wind when you spray too, here is the most recent time I rattled it. Using flat paint will help for less spray lines. Since I have a lot of rattle can hours under my belt I went with a semi gloss this time. took me about 13 hours with prep and R&R. I like how it turned out, and you will too if you do it well.
Keep up what you are doing and make sure you take your time on things. It can look really good if you put the effort into it.
Here is the current finished rattle can job.
Oh, and my daughter loves MLP and rarity is her favorite. I will definately be showing her pics of your truck as you progress with it. Good luck and keep the pics rolling!