Good morning Sunflower :)
Just remember the phone call is just a temporarily uncomfortable moment in time. We've all had them. The truth is, things have changed and you are unable to take the position, for personal reasons. Or, due to unforeseen circumstances, you are no longer able to take the job. Things change, everyone understands that. You don't owe anyone an explanation of what the personal reasons are. So, you don't have to go into details which will make it more complicated. Keep it short and simple and thank them for their time and you're good to go. Just say what you feel comfortable saying without going into long explanations of why. If they press you with a lot of questions (which they shouldn't) you can just say, I'm sorry, I have to go, and end the conversation. The important thing is that you learned to not to repeat history. Stick with your subbing and don't sign up for anything else. You will be a lot happier and less stressed. And, believe it or not. If you say, "No." to somebody, they really don't think about it all day long. They shrug it off and move on :) I used to say, "Yes.", to everyone, to my own detriment. I learned (after years) that it's better to be temporarily uncomfortable and say, No, than it is to say Yes and go through the agony of doing things you don't want to do. Just so I never get caught off guard, I have standard sentences to say if someone asks me and I either am not sure about it, or I don't want to do it. I just say, I'll check my calendar. I'm not sure, I'll have to get back to you (but then you have to get back to them and say No :) I'm sorry, my schedule is busy this week. Don't offer, oh thanks, maybe next time, because you'll have to get out of it again later :) Hope some of these tips help. My daughter is amazing. If she doesn't want to do something, she just says No and offers no excuse or reason why, she just can't do it and will say she just can't do it until they stop persisting with wanting to know why. Her friends all know if she says No, she means No and they drop it. This too shall pass. You'll do great, and once you get finished with the call, you will feel great. And, you will feel super that now you know yourself and will not get yourself into a similar situation again. And, if you do, we all make mistakes, and you know how to take care of it, and move on.
Shari