I can't point to specific care to be taken but, think what if, the task you are trying to do fails/ is not successfull. Whats the remedy ? How are you going to take the database to original state. This is with regular day-to-day maintenance after having a solid plan for the task.

When you hit the problem and its critical don't be panic! write down the steps depending on the time you have and try making backup copies of the files you are above to play with as a part of problem resolution.

And you have dbasupport.com and other sites to help....