Help your customers through your process and they will be your advocates

If there's a quirky or different part of your company up others then In my eyes, you've got a choice. Either-

Ensure there are always staff to hand to explain

Or

Ensure there is sufficient clear signage to explain.

In talking about parts of your business where customers don't intuitively know what to do. The ticket machine that required you to put your card in and remove straight away to work, the self-service till or well, pretty much the self-service anything. It shod be enough that you can have one team member looking after 6 or 8 tills, don't take this team member away!

Ikea does this beautifully with a mi. of the above approaches, more signs than staff though. It uses explanation and a little humour to let customers know that they will be picking and assembling the furniture themselves and the fact that this helps to keep the cost down. In fact they've now taken this quirk into a virtue - it's part of their business, their ethos.

If you have a part of your business that needs a little explaining or guidance then don't be afraid to explain or guide - your customers will appreciate your help and give you honest feedback about the process at the point that it's happening - one of the buzzwords in retail at the moment is "in the moment feedback" and it doesn't get more in the moment than that.