I think the important start to successful mainstreaming is to develop a positive rapport with General education teachers. One thing I found helpful is to offer your help to the general education teacher. If possible, I would try and come up with short fun lessons I can do in gen Ed classroom. Or possibly, just read a story to class so the students and teacher get to know you. Sometimes it is difficult for my whole class to go into the gen Ed setting, so I invite small groups to my room to be peer helpers or to do a fun lesson. I found that teachers and students enjoy this arrangement. Once positive rapport develops, it is easier to have more ongoing mainstreaming on a daily basis.