Most efficient way to change site structure?

[dignan99]

I would like to change my sites structure to be more efficient for SEO.  I have a fear that the changes will have a potential impact on my current rankings, but know this would be a good long term decision.

My site is wordpress, so the changes are relatively easy to make.

What are some ways to change the site structure without damaging your rank?  I would have to have to clean up a bunch of errors, so is the best way to simply do 301 redirects on the old pages?

[MarcLevy]

Making solid SEO changes will only have a positive impact in the long run. However there is no magic i'm afraid, and like everything there is a ying and a yang and unfortunately you may see a dip in rankings whilst Google reconfigures itself based on your changes. If your changes are done correctly this should not take too long though.

I would have to have to clean up a bunch of errors, so is the best way to simply do 301 redirects on the old pages?
This really depends on what the errors are?

[RyanKent]

Can you offer an example of a couple URLs in your current structure, along with what you plan for your new structure?

Regarding the errors, do you have them now? Or do you believe the change will cause errors?