Most home and landowners will attempt to level a yard before building or landscaping, but that isnt always possible with steep slopes. It is important to landscape and build retaining walls for these steeper grades, or you could find that the land erodes away quickly, or worse, collapses completely. Unfortunately, building a retaining wall on a steep slope is not something that you can take lightly, nor is it something that could be done in one quick weekend.
Your best bet before building a retaining wall on a steep slope is to find a professional. There are so many different engineering aspects to building a wall that will withstand the pressure that you cant just leave the task to an everyday handyman. There are some tips and tricks to making it a bit easier, but most would suggest having it done by a professional to save yourself the time and money that might be needed to fix mistakes. And a mistake with a retaining wall could be a very expensive and dangerous mistake.
Most steep slopes will be graded into terraces. This will remove a lot of the pressure put on the retaining wall, and it will also give you more usable space for landscaping. The terraced steps can then be home to flowers and plants, or you could even let up furniture for a garden oasis. The materials used for the retaining wall are entirely up to you, and that will give you at least one way to keep a bit of control over the construction in your front or back yard.
It can be hard to hand over that kind of control to a professional, especially if you have always thrived on doing everything yourself. You must keep in mind that retaining walls are washed away all the time in heavy rains, and you could put yourself at risk for the very same thing if you try to cut any corners by building a wall on your own. It is better to just hand over the control to a professional with the necessary training from the very beginning. You will see that the job is completed much more quickly and safely than if you had tried to perform the construction on your own. There might be more significant prices involved when you use a professional, but the cost is always worth the investment in the long run.