i weaned at 15mnths after agonising about the same things....
i had a double blow by not only him loving his BF but also me feeding to sleep

..
he just wasnt into bottles at all.
i tried substituting one feed with a bottle (formula and expressed to get him used to it)...no go.
in fact most things i tried just were not happening.
in the end i stopped cold turkey!!!!no more.
very emotional for me but i had to remind myself that it was waht i wanted and that it was taking its toll on me....plus i did not want to BF a child much over one yrs old.
it involved keeping him very busy....to keep his mind off it. (all hands on deck from the family) and at night he was offered a bottle which he refused so was put to bed and left. he did cry but it wasnt for long at all...in fact he got on extremely well and by a week he was over it completely.
he was a good eater so the fact he went from 2-3 BF a day to no milk at all didnt matter and i have learnt that they can survive quite fine.
alot of this process was made worst by myself and what i THOUGHT needed to happen.s for years so i was used to that. i have learnt he will easily sleep without the comfort of the boob.
best of all......everything is SO MUCH EASIER!!!! he is just picked up and put in bed...no feeding for 20 min i have so much time left......
...i am free plus the bonus of losing some of thatr unwanted body fat that lurked around when feeding!!! lose weight when BF...what a load of crock!
good luck....just do it...but you need to be committed and strong willed!