Just found these forums a couple weeks ago; makes me wonder how the hell I managed to get into my schools of choice because I wasn't anywhere as organized, intense, tedious, etc. about this whole process. Perhaps that also worked in my favor. So, here's my advice:
Don't take this process too seriously. Just chill out. Stay away from these boards (but do check interview feedback). Stop worrying about every little thing and don't stress out with applying months in advance. Relax. Don't let pre-med this and that consume your life- too much pressure. You could be out volunteering or flying planes or doing other interesting things that could help you more in this entire process.
Your job as an applicant is to make yourself memorable. Distinguish yourself. That's the most important thing. Med schools love diversity of interests, ethnicities, backgrounds, etc. Determine what it is that makes you unique and stress this.
Do ECs that you're interested in and not just those that you 'think' could help you in med school. Include a diverse array of activities that will demonstrate your well-roundedness.
Have fun at your interviews. Relax, laugh, ask questions. Be genuine, honest, and relatable. Don't give robotic answers; this should be a conversation.
Know the relevance of your research and be able to defend it and explain it to a Ph.D. and a 12 year old.
Write a memorable and compelling PS. Don't waste words with quotes. An intriguing PS is key.
Don't be afraid to apply to your dream schools.