Setting up a dome tent by yourself is "messy" but certainly do-able. With tents with sleeves for the spring poles, insert both poles with the tent lying flat. Take one corner of the "bottom" pole and insert it in the corner pin. Walk around to the opposite corner and push / bend the pole enough to fit on the corner pin. At this point the tent is oblong. Take one end of the "top" pole & insert on the corner pin. Walk around to the opposite corner, then pull the tent corner and push the pole until the pole goes on the corner pin. Straighten the tent and center on ground cloth, then stake.

This is easier with a tent that uses clips instead of sleeves. Take the spring pole and insert in corner pin. fasten two clips closest to that corner to pole. Push / bend pole to insert in opposite corner pin. Fasten two clips closest to corner. Repeat for second pole. Straighten tent. Open door to tent and stand in opening to reach the clips at the top of the tent and fasten. Center tent on ground cloth and stake.

No need for weights, pre-staking, or using tall objects to hold the tent up. Just practice.