Most of the weight of Apollo package at the low earth orbit was fuel. Fueling in space was not considered I suppose as this was too difficult with technologies

Most of the weight of Apollo package at the low earth orbit was fuel. Fueling in space was not considered I suppose as this was too difficult with technologies from sixties. These days it is considered possible, so launching Apollo-size package to the Moon should be possible with much smaller rockets and refueling in the orbit.