 You have so much leeway to say no if you do this by saying no to the offer or invitation without saying no to the actual person. If you don't have boundaries, a lot of times you don't even realize that you're being taken advantage of until it's too late. True that most of us don't realize that we're people-pleasers and almost all of us are people-pleasers. I do in my MBA class a 24 hours of no challenge and this is actually our very first challenge for the class and it's scary and it's fun and I encourage anyone who's listening who thinks that this might be helpful for you to play this game where for 24 hours you say no to every single person who asks you for something. You can do whatever you want but I recommend that you practice saying no as simply as possible.