You can do it. Try analysing annotated master games and do post-morta with stronger players if possible. You should also have a nice reading list for studying alone since coaches and stronger players aren't always going to be there.
Start off with Averbakh's Chess Endings: Essential Knowledge or Nunn's Understanding Chess Endgames. Capablanca's Chess Fundamentals and Chirnov's Logical Step Move by Move are also musts. Also Endgame Tactics (Fourth Edition) is optional but good to have.
Analyze your games, see where you went wrong then analyze with a computer to see what you'd miss. One needs to work on their thinking process mainly. Look at checks, captures, and threats first and if they don't help you with a tactic or plan then look for quiet options.
He was the champion of Xiangqi (chinese chess) before starting to play chess. I'll assume that that training was useful in his new profession.