am i crazy to build a patio or deck if i have limited experience?

wouldn't be that big. about 20'x25' and only about 2' off the ground for a deck. i have a very talented friend when it comes to stone and brick work, maybe a patio with his help would be easier. i want my yard to be a showplace, but can't spend a million. is it worth it to pay a pro or can i get some good info on building it with my friend. thanks for your time