Let's get to the nitty gritty of it. It's not as easy as it looks. They don't just let you loose serving alcohol all day when you start; you have to go for an all day training course before you do anything, and continue to do online training whilst you work there. Compared to a whole lot of other pubs you could work in, Wetherspoons are surprisingly strict. Just putting it out there, but a Spoonie knows what they're talking about when it comes to products.
In case of a random inspection (which happens weekly), you have to know how to perfectly serve every single drink available, which glass it needs to go in, how much ice you need, etc etc. You even need to have things perfect down to the bottle facing the customer. It makes you disciplined and ensures that you know exactly what you're doing, so make sure you respect your server.