There are two problems with this, but both can be solved by having two people. The first is you'd probably have to get someone else to hide the scent for you.

There are two problems with this, but both can be solved by having two people. The first is you'd probably have to get someone else to hide the scent for you. Not so easy when training solo. The second is that when you want to reinforce a behaviour you generally give a trigger or marker as soon as possible after the event. If you wait too long, the dog may associate the marker with another behaviour they've done in the meantime and overwrite the correct learning. So a 'yes' or clicker as soon as the dog alerts is the best way to go. But if you yourself don't know where it is, you risk reinforcing a failure. This is easy with a helper so you can glance at them and they indicate if you are correct or not.