2NT shows 10-12 balanced with no 4 card major.
Partner leads the ♥2 and the 5 is played from dummy.
First decision: Do you play the ten or the seven?
Spoiler
Second decision: What do you switch to now?
Spoiler
Final decision: Now what do you do?
Spoiler
Full hand with play in spoilers (names changed) and you'll be able to see how each decision would have worked out.
Spoiler
I got a new laptop today, so getting used to the new keyboard. Apologies for any typing errors throughout this. This was a somewhat frustrating board for me, but despite the title, I don't consider myself blameless. Try to decide what you would do before reading the play in spoilers after each decision point (in bold). Anyway, you play 2/4 leads with udca (and no smith) and McKenny (Lavinthal) discards, here is the hand in question: 2NT shows 10-12 balanced with no 4 card major. Partner leads the ♥2 and the 5 is played from dummy.
First decision: Do you play the ten or the seven?