Sounds like you got the technique down well. I found that easiest as well. Also, good tip on the extra water bottle. I had used some VR bottle plastic I had left over from my VR mod on the P3 (see below, aero 30 wasn't fully latched down here, hence the look of the gap) and it reached it's transition temperature higher than the aero 30. Made for some patience. Don't use bento anymore

Overall, this isn't hard. You just need patience. And I appreciate the credit ;) Doubt I'm the first to do this though.