I have a small backyard around 65X10. Most of the yard is flat, but I have little bumps here and there and in the right conditions I can squish them down to a manageable level. I'm not trying to coat my entire yard with sand, compost and seed. I'm just looking for a simple solution. I work in concrete for a living and have at my disposal... A plate tamper and a smaller walk behind roller. What I'm getting at is, can I just use a plate tamper over the bumpy parts of my yard or will it damage it further?