CCNA- should I take it one part at a time or both same time?

in CCNA & CCENT
I see theres an ICND1 and ICND2 tests to make the CCNA. I am debating whether or not to take both at same time or do ICND1 first and then 2 or vice versa. Any suggestions?
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Goals 2016: CCNA Sec OR CCNP R&S
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Of course if you aren't new to networking or are re-certifying then the 1 exam makes more sense.
Still in two minds myself as to which route to take. Often someone posts a question on here, or I come across something at work that I have to Google the answer, which makes me think I'm not ready enough to do a single shot. But then it would be nice to get it in one go...
A case of the exam jitters? Relax, however you need to, and be confident in your answers (easier said than done, right?). You'll do fine, and even if you do not pass, you'll learn in what areas you need to grow.
Good luck, sounds like you'll do fine though.