Wine Service Training

Looking for tips to train servers mostly on opening bottles of wine. I have a couple servers who are great in most ways but are not comfortable opening wine. I do try have the bartenders ask them to open bottles needed for btg service as practice but that’s not always practical. Theses particular servers aren’t big drinkers so they don’t get practice in their personal lives. We don’t do a lot of wine by the bottle but I want my servers to be comfortable with this. Any tips?