A guide to moving securely from Blogger / Blogspot to a self hosted WordPress blog. In short here are the key steps: Export/backup from Blogger, import via a great WordPress function, then set up secure redirection from old URLs to new.
Blogger to WordPress in 3 Steps
It’s not complicated, but should be done with patience and care, otherwise you’ll lose traffic you’ve worked hard for!
Step 1 )
To export from Blogger, click on Settings > Export Blog- this will backup your posts and comments. You can click Design layout, edit html and Download to backup your design.
Step 2 )
Very simple step – set up your WordPress blog. In the admin areas, click Tools > Import. Select Blogger and upload the file you saved before from Blogger. All your posts and comments will come steaming in 
.
Step 3 )
Redirection from your old Blogger pages to new is still not elegant. Blogger is typically restrictive with this. One option is to put a sticky post or a box at the top of your old Blogger page saying We Have Moved, click here. This should take care of a lot of your traffic, or regular readers.
If your old site has some good links coming into it, consider contacting the webmasters of these sites, lettng them know the location of your new site.
A not-very SEO friendly way to redirect has been detailed by this kind chap.
Moving to WordPress from Blogger can be tricky but it is worth it!!! Now go for it!!!
