Depending on how big of a yard you have this can be quite involved, but also very rewarding. There are many tutorials online how to do this yourself. I suggesting reading a few of them to get a understanding of what they process will entail. A quick Google search of “sprinkler installation diy” yielded many good results. This looks like a good one to start with: http://www.diynetwork.com/how-to/outdoors/landscaping/how-to-install-a-sprinkler-system
If you need detailed help with a specific part you can always post it here. Reddit is always a good resource for help with specific questions, you just have to find the right subreddit. This would probably be the one to go to for help with a diy sprinkler install: https://m.reddit.com/r/Irrigation/