H.J.
ok, I went through this too. twice with the same child. My son is very stuborn so with us things have to be very cut and dry.... When it was bed time we put him in his bed, tucked him in read a few books till he was cozy, and then just walked away. we shut the door and he had to stay in there. I won't tell you he didn't scream for a long time at first, but I knew that his room was safe, he had a night light so he wasn't scared and we just had to let him get used to the idea that bed time was bed time... Also I know a lot of people are against it but if I caught him with a book or a toy in his bed up playing as long as he ws being quite that was ok... I figured it let him adjust to just being in his room alone, when he was tired he would put the down down and fall asleep.
If listening to him cry is something that makes you crazy, I suggest first making sure his room is totaly tantrum safe and that he can'e get hurt no matter what he does.. and then you can take this time to take a shower or step outside for a cup of coffee. What ever it takes and then just make sure you check on him with in 10 min. Alex usally took 7-8 minutes to calm down and get distracted.
something else we had done, was we did a dutch door on the kids room. where the bottom and top close seperatly. so we close and lock the bottom at night and the top stays open, so we can hear and they don't feel closed away from the family. Then as soon as they are asleep we unlock it so they can come to us at night or potty.
probabley not too orthodox but it works for us!!