Stones can be cheap. But, putting them where you want them? That could be the expensive part.
Hardscapes should be designed and installed to last forever. For that you could need a pro.
Before hiring some help, consider how you want your lawn to look when you eventually are finished, even if you can afford to just install a portion of the hardscape to start.
Watch this video -- Part One of a series on planning your hardscapes -- to learn more tips and get some words of caution. And use Kudzu to find recommended landscape architects
near you. Watch Part Two