Errors during “import-b2.php” dare not continue

OK, I’m still having fun and games attempting to get myself upgraded from b2 to WP 1.0.2
I uploaded all of the required files and then simply ran the file (on the server):
/wp-admin/upgrade.php
This moaned about not having WP installed, so I actually installed the program (having remembered to change the prefix in the wp-config.php file to b2_)
This seemed to work OK, there were no actual error messages that I could see.
Next I ran /admin/upgrade.php once more and this time it looked a lot better, two pages and it told me everything was done.
Finally I ran /wp-admin/import-b2.php and I’m afraid the results page looked a lot less friendly.
Here is a copy & paste of the output at “Step 2”:
Step 2
First we’re going to add excerpt, post, and password functionality…
SQL/DB Error:
[Duplicate column name ‘post_excerpt’]
ALTER TABLE b2_posts ADD COLUMN post_excerpt text NOT NULL;
SQL/DB Error:
[Duplicate column name ‘post_status’]
ALTER TABLE b2_posts ADD post_status ENUM(‘publish’,’draft’,’private’) NOT NULL, ADD comment_status ENUM(‘open’,’closed’) NOT NULL, ADD ping_status ENUM(‘open’,’closed’) NOT NULL, ADD post_password varchar(20) NOT NULL;
That went well! Now let’s clean up the b2 database structure a bit…
SQL/DB Error:
[Can’t DROP ‘ID’. Check that column/key exists]
ALTER TABLE b2_posts DROP INDEX ID
One down, two to go…
SQL/DB Error:
[Table ‘prawling_b21.b2_settings’ doesn’t exist]
ALTER TABLE b2_settings DROP INDEX ID
So far so good.
SQL/DB Error:
[Can’t DROP ‘post_karma’. Check that column/key exists]
ALTER TABLE b2_posts DROP post_karma
Almost there…
SQL/DB Error:
[Can’t DROP ‘ID’. Check that column/key exists]
ALTER TABLE b2_users DROP INDEX ID
Welcome to the family. Have fun!
And that is my current status.
The link at the bottom of this output page “Have Fun” is a link to my Blog URL however I dare not click it.
In case something has gone badly wrong and then somebody tells me I need to hit a “back” button and make a change.
Can anybody tell me if what I see above “matters” and what is likely to happen when I click the link to end the installation with the above “errors”?
Cheers in advance.