Well whoever is your shift should be allowing you to go on bar, especially during slow hours to practice actually making drinks. There’s no amount of ‘training’ that can help you get used to bar... you kinda learn as you do it and if you really think its a problem I’d talk to your shifts about it

Explain these exact same thoughts to your team members.

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Any colleague who expresses concern for his ability to pull their own weight and showing a willingness to improve is a good person in my book and I would help accordingly to the best of my ability. (Assuming I care about my job and team)