I'd say "Yes". You can be prepared enough. However, you are never done getting prepared. You will always be on the lookout for items for your survival kits. Something smaller, something lighter, something with more multiple uses and so on.
Reminds me of a conversation I had with my daughter's boyfriend. We were talking about Katrina, and I offered the opinion that people who live in disaster-prone areas should be better at getting prepared, since they live through more potential disasters and disasters year after year.
He asked, "But how many times can you prepare for a disaster?"
And I answered, "You only have to prepare once. Thereafter, you do maintenance on your preparations."
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Knowing where you're going is NOT the same as knowing how to get there.