Foot Range
How much would it cost (general range) to install a sprinkler system in a 5000 sq. foot yard?

Get 3 estimates from licensed irrigation contractors. Half of the average is the cost for you to install it yourself, soup to nuts. All the tools, fittings, and heads. Now it's up to you to figure out if your time is worth the difference.

I never recommend a homeowner installing their own sprinklers. Too many variables and you end up paying more to fix your mistakes.