If you want a 1v1 you can ask someone. I have done this a few times and I feel it's a great learning experience.
If you don't want to ask for a 1v1, then you could grab DT, go out to a base that has no horde (and is far away from the horde) and loiter inside their radar (don't drop the dar). Once you have an upper, drage them away from their ack so that they can't run to it. Wait for them to climb co-alt, then turn in. Don't ho on the first pass, if they try to then just climb above them or deflect. These are hard to set up since you usually get more than one upper.
Speaking of 1v1, JUGgler would you be interested in said 1v1?