Resize and split tempdb in SQL 2008 r2

Hi, i have a 2 node cluster running on windows 2008 R2 with SQL 2008 R2.

I am wanting to resize my Tempdb size from 10gb to 2gb and split it into 6 files.

Now in my testing environment i just restarted the SQLserver service to clear the tempdb database.
Then I change the file size to 2048mb under the db propertise for the TEMPdb mdf. i restarted the sql services again(so i could confirm the size changed to 2gb) then ran a script to create 5 more tempdb ndf files with the same size and auto resize properties.

This seemed to work fine but before doing this on my live clustered environment i just wanted to see if this method is ok or if there is a more preferred method?

24 physical cores, thanks.