It's tough to say no. You don't want to let people down, and you don't want to miss out on a great opportunity. Nonetheless, you can't say yes to everything. The hardest part isn't saying the words, but rather convincing yourself that "no" is OK.
Grace Bonney, in a post on her blog Design*Sponge, points out that you simply have to understand that these offers are positive indicators of your success -- not something you must do.
I've found that the first part of learning to say NO is learning to accept that offers and opportunities are merely an indication that you're on the right path- not that you've arrived at a final destination you can never find again.
If someone is choosing you, it means you're doing something right. And that is the biggest opportunity you can receive- the chance to recognise that your hard work is paying off. And if you continue to do good work, those opportunities will continue -- and improve -- over time.
Just say yes to the opportunities you like and be appreciative of the ones you pass up. There's no reason to stress -- they're just an affirmation. For more on saying no, check out our guide.