Biting off more than you can chew means that you take on too much work than you feel that you can do. For example, if you have a full time job, you coach your son’s soccer team, you are writing a book, you are taking a weekly yoga class, you are taking an English class twice a week, you go to the gym 3 days a week and you have to walk the dog 4 times a day! That is biting off more than you can chew!
I am currently biting off more than I can chew but I have been presented with quite a few opportunities so I am taking advantage of them! I feel a little stressed with all of the work I am doing but I am managing to do it.