@IT73: From what I can gather, Nest isn't available for wearables. If it isn't visible in the Galaxy Store via the Wearables app on your phone then I wouldn't advise opting for a third party avenue, as it may cause performance issues.
Cheers. It was, via a 3rd party app, but now pulled it would seem. Thought I may be able to do it using Smartthings perhaps, but seems they don't support Nest, perhaps something to do with Google purchasing Nest. Likewise with possibly using IFTTT