no negative self talk at all costs.
your subconscious is always listening, believes everything you tell yourself and will make it true
this is how the placebo effect works, it's how joe dispenza completely healed his spine with his mind, it's why when you tell yourself when you'll wake up before going to bed you do.
when negative self talk arises, stop feeding it. just tell your mind to STFU and move on.
this is the key to success, health and happiness.