Ok, I clearly have an unpopular view here

. When I got my road bike about 18 months ago, it was the first time I'd ridden a bike since I was about 10. I was timid and nervous. I left the cheap test cages on for about a month, then decided to get clipless pedals. While I definitely learned to use them

! I really got them too soon, I still lacked confidence in my riding skills in general, and the pedals added a huge amount of anxiety for another month or so. It's all sort of a wash in the end, because you eventually learn to swim if you're tossed into a lake, and I certainly did. However, I think I would have had a few months that were less anxious in the beginning had I waited a bit longer to transition to clipless.
That's just me, and I think I was an extreme case in terms of how unnatural biking felt when I first got my bike. I should add that 18 months later, I'm very confident and clipless pedals are completely natural. I've test-ridden bikes recently, and I find when they put cages on them, I miss my clipless pedals but I'm fine, and when they put flats on them, it drives me absolutely crazy.
I have to say, I've read several threads here where people discuss how dangerous and frightening and unnatural cages are, and each time I just can't understand. I'm not the world's most coordinated person and as I've said, when I first got my bike I was scared to death of it, but from the beginning I never had a bit of trouble with cages. My only complaint is it's a little bit of a pain to have to turn them over when starting at intersections -- but even that is just a nuisance, not something that is difficult. (That said, I'm sure happy to have clipless pedals and not have to tolerate that nuisance).
So, I would say, don't feel like you HAVE to get clipless pedals instantly; ride your bike for a week and gauge your comfort level, then decide. And try not to feel pressured, even then, if you're not totally comfortable.