Convert rollback segments to undo tablespace

Are there any gotchas I need to be aware of when converting a database using rollback segments into using undo tablespace in Oracle 9i?

I think the steps to be followed are: Am I missing anything?

1. Find all rollback segments
select segment_name, tablespace_name from dba_rollback_segs;

2. Drop all except for system
alter rollback segment offline;
drop rollback segment ;

3. Drop rollback tablespace
alter tablespace RBS offline;
drop tablespace RBS;

4. Create the new undo tablespace
create undo tablespace APPS_UNDOTS1 datafile '' size reuse extent management local ;

5. Add undo_management = AUTO and undo_tablespace = APPS_UNDOTS1 to init.ora and comment out the rollback_segs parm

6. Bounce the database and take a backup

Move steps 1, 2 and 3 after step 6. It should be 4,5,6,1,2,3.

HTH

Thanks, I will give it a shot.