L1, L2 Visa

I had the bitter experience of L1-A blanket getting rejected. My company applied for Individual under premium processing, but overall it took 2 months to get the visa in hand.
Blanket:
I think lack of preparation was the main mistake, when we are struggling to get all documents in order, we may lose the main point: preparation, so please don't do that mistake, prepare well for 3 basic questions
1) YOUR ROLE
2) WHAT FUNCTION (EXPLAIN THE FUNCTION)(for functional managers)
3) WHAT YOU WILL DO or WHAT ARE YOUR DAY TO DAY ACTIVITIES: MOST IMPORTANT

Points should be flowing as soon as you could relate the question to any of the above 3 questions, they can ask whichever way they want, example (WHAT DO YOU DO). I don't have reports, but I'm managing a function and key partners, that is another good selling point for functional managers. If ever you are asked a number, for example, number of indirect reports, have it ready and it should be big and good, not 3-4... you can add your partners/QA you manage as well.

Attire: For L1A, blazers is recommended, VO's are wearing tie.

If the points are not coming out, write it....again & again...also try to have a logical flow in your mind. Ask your spouse to take some mock interviews ... or even as someone else suggested in this forum, look at the mirror and practice.

Hope this helps someone. Be yourself, don't try to look confident if you are not.
Feel free to ask/pm me any doubts, I can help if needed. I can't thank enough people who have helped me from this forum.
PS:DS 160, while filling 2nd time, there is a question whether you are rejected a visa, my attorney mentioned the answer should be "NO" as the visa is not rejected but the blanket petition. Initially I said YES, then I changed to NO and rescheduled appointments.