Weaning baby?

My little guy is almost 20 months old and still wants to breastfeed as much as possible! Hes a horrible eater and so sometimes i just give in and nurse him so that he gets something in! 
I wanna wean him now but have no idea how! Ive tried to not nurse and he just screams and screams until i cave..he doesnt get distracted by anyhing and becomes all stubborn! 
How did you guys wean your babies? 
Desperately need some tips and advice!