Lightspeed ecommerce expert for initial and ongoing jobs

I need some changes to an existing website. I have a Lightspeed ecommerce site selling shoes. My issue is that when a visitor goes to a product page they often see that a product is out of stock. However, it is in stock for many sizes, but not for the one showing I would like the product to either 1. Show that it’s in stock for the first available size (not displaying 1ST the one that’s out of stock) or 2. Have text showing in the size field on all shoe products that says choose your size (and showing that it is in stock) - but I don’t want this applied to other product categories such as handbags Can you please indicate what level of experience you have working with Lightspeed and if this is something you have addressed before Thanks