You have two options for building a retaining wall with concrete. If you're set on getting the job done yourself without professional assistance, using concrete blocks is the way to go. Concrete ...

You can buy retaining wall blocks at Home Depot for as little at 60 cents each, and spend up to $3 each for larger and nicer blocks. You’ll need a shovel, mallet, hand tamper, wheelbarrow, yard ...

Size the trench so there's enough room for the retaining wall block and at least 8 in. of space behind it. Excavate deep enough to completely bury at least one full course, including space for 6 ...