Yeah, I'm sure it's easy enough, but I've never tried, would need to buy the bleed kit and all that...just wanting to avoid it for now.
It depends on what tools you have and access. You will need to place the car on a lift or on jackstands.
Procedure: once the car is off the ground and all wheels have been removed, open the brake fluid reservoir. Wear gloves, ensure you have clean rags or shop towels and either a spray bottle of dish soap and water or isopropyl alcohol-for cleaning up any spilled brake fluid, which is very caustic to paint.
Use a turkey baster to suck up the majority of the old fluid, at least down to the low level. Pour in new DOT 3 fluid.
Next, start on the driver's front and attach a bleed hose (you can make one with tubing and a water bottle or use a hand vacuum pump). Using a 8 or 10mm wrench (can't remember size for sure) open the bleed port on the caliper and pull fluid into the sump until fresh/clean fluid is observed. Ensure you check the fluid in the reservoir before and after each wheel. Add fresh fluid to keep the level filled.
Order of bleed: Driver front; Passenger rear; Driver rear; Passenger front. Use the soapy water, isopropyl alcohol or brake cleaner to clean any residual fluid.
If you do not use a vacuum pump, have a friend help to pump the brake while you bleed the caliper.
This sounds way involved, but it is pretty straight forward.
Average cost from the dealership will be around $85 - $110