One time, I thought I knew, but now I'm unsure.
I have been practicing drills in sidemount, with up to two ponies, for a good nine months. I am (was?) fairly confident in my abilities and was ready to take the next step, like a wreck penetration class or cavern class.
Then, for various reasons, I did not dive my sidemount for at least two months. I dove recreationally for a week. I returned to the pool for some extensive drills, especially with my new can light. (Pool -- my local diving, for those not familiar.)
I was dismayed to find I made several errors in what used to be a smooth practiced checkout.
Is this 'just having a bad day', or do I need seriously more practice / experience before seeking advancement?
I have been practicing drills in sidemount, with up to two ponies, for a good nine months. I am (was?) fairly confident in my abilities and was ready to take the next step, like a wreck penetration class or cavern class.
Then, for various reasons, I did not dive my sidemount for at least two months. I dove recreationally for a week. I returned to the pool for some extensive drills, especially with my new can light. (Pool -- my local diving, for those not familiar.)

I was dismayed to find I made several errors in what used to be a smooth practiced checkout.
- Forgot my two shoulder trim weights.
- Forgot to check the operation of my three lights before hitting the water.
- Forgot to set the zero on my watch. ('bottom timer')
Is this 'just having a bad day', or do I need seriously more practice / experience before seeking advancement?