If it's of a reasonable size, & assuming it's not self-propelled, it's quite a strain on the shoulders & stomach muscles, & you have to develop a knack of making it pull forwards without letting it rush away. It needs to be rocked, & allowed to dig well down before moving on. It can look as though it's digging deep when it's only fluffing up the soil.
With hard ground, go over it once or twice - just scuffing the surface, before trying to dig.
Yes - get his help!! = Tim