Sleep training 4 months old with a professional

Hi Mummies, I want to ask if anyone hired a sleep trainer for their baby? My boy just turned 4 months old and I am thinking of hiring a sleep trainer. Currently he gets ups after 5 hours and then will keep getting up with eyes closed every 2 hrs. Hence thinking of seeing professional help so that him as well as me and my husband can sleep peacefully. Is it worth doing? Anyone can share their experience? Also any recommendations for good sleep trainers ? #pleasehelp #FTM