umm depending if you have had any past experiance and how confident you are. could do the prep work your self, such as getting the car primed up and everything, takes a while and your car while look funny for a while but it really cuts down man hours therefor taking a huge chunk out of the cost,
me and my mate worked on priming his hilux mini truck every weekend, took a while but that was because we were shaving door handles etc.
it is time consuming but the longer you take to get the primer on there right and sanding it back so its 100 percent perfect the better finish you will get.
this is my mates car preped and when he got it sprayed hope this helps, if it doesnt then shoot me