Digital BW, The Print

Is there any received wisdom on when resizing of an image should be done during processing?

From experience, but not careful testing, I do any upsizing in Photoshop as early as possible in my processing, but after I have performed any necessary noise reduction.  

My untested thinking is that upsizing before noise reduction might make noise reduction less reliable, since upsizing always involves *some* degree of guessing and so has some reasonable likelihood of producing random noise artifacts.  (I use noise reduction plugins that rely on analyzing the image, or a representatively similar image. The more uniform and predictable the noise is, the better they seem to work.)

Have any of you done careful tests to solve this problem?  If not, does my approach seem sensible?

Every time I decide I should test this, I run into complications in the nature of “well, it depends. . .”.   And, of course, it usually doesn’t make any visible difference at all when I finally just get it up on the wall. :-)

Myron