help changine engines

i need some help to change the engine on a 90 accord ex. i read the manual and still need more help. if u guys know any websites that i can go and read it will be helpful. and do 90-93 accord lx and dx engines go in my 90 accord ex withour any problem. is it going to work fine. please help i need to fix this car because if i can fix it my family its going to give me that car so help