Limited Tips
You have the smallest card pool and the least amount of control in Sealed, that's what makes it a challenge to master. You only see 6 packs worth of product. In Booster draft you see several hundred cards and get to pick colors and combinations.
Find people who are better than you and discuss Sealed strategies. Be open to criticism.
Drafting: Know which uncommons and commons could be signals before you sit down so you only have to take note of 3-5 cards in each pack.
Team Building
Pro Tour teams are very calculated and essential but at lower levels it's hard to crack the meta game because there are SO many participants.
Play Testing
Look for the crux of each match instead of just recording win/loss ratios for each match up.
Improvement
Walk around your game store after a FNM or draft, people leave product all the time that you can snatch up and re-pack.
Build a realistic, limited cube so you can practice drafting over and over again without spending a bunch of money.
Magic Resource
TCG Player - More beginner friendly content
Channel Fireball - Higher level content aimed at Pro Tours
Interview Links
MTG Potpourri Podcast - Conley's very own podcast
Connect with Conley
Twitter - @Conley81