Obstructive Perfectionism

One of my challenges, lately, with accomplishing decent-sized tasks has been perfectionism coupled with inadequate follow through. By that I mean, I'm

• smart enough to run far with the idea (or realize it's "breadth" potential)
  
• rather overly detail-oriented (giving it "depth" potential)
  
• not focusing well enough, or making enough time, when sitting down to do something about it

Historically, I've looked at outlining tools to help with the first two. For the last one, I've looked at task tracking and prioritization tools. Natara's Bonsai, FreeMind, flavors of GTD, and varieties of TiddlyWiki have all been attempted, with varying degrees of success.

I think I need to schedule more of my own work time, instead of letting other meeting invitations fill up my day, and improve my focus, or eliminate distractions, during that scheduled time. Why is this so hard? I have several friends who are much better about both. Why can't I imitate them more effectively?