Make it a project and spray it yourself. If you have to buy equipment, like compressor, then expect the cost to be around or less than £600 to spray your car in full black. The major cost will be getting a suitable compressor (you can get a 9cfm 50l compressor on ebay for less than £200 and it will be sufficient to do your entire car). Black hides a multitude of imperfect spraying, and your work will definitely not look like Baldy's work. However, it will look better than it is at the moment, and you won't have to spend thousands of pounds that you will never recover.
If you want a full colour change, much of the work is the prep work. Once you are committed to doing the prep work absolutely right, your final spray will look good, even for an amateur. Just choose the right paint.