Struggling to get my 2 year old to be potty trained, any tips or tricks?

My eldest boy turns 3 at the end of March, he knows about pants and using a potty and what it's for. We're struggling with him being aware of when he needs to use the potty so he can sit on it beforehand. Any advice would be welcome. Thanks via /r/Parenting http://ift.tt/2iRqohk