Explain which aspects you need to think about and why, and give a deadline for when you'll have the answer about those particular aspects. The cases where you

Explain which aspects you need to think about and why, and give a deadline for when you'll have the answer about those particular aspects. The cases where you genuinely need to "think about it" are few and far between. I would even go as far as saying they are inexistant. The vast majority will be "I don't want to do it, but do I like you enough to do it?".