HI,
I would propose instead of paying for a 1 time job, why don't you invest in getting a photoshop-resizer-script done for you?
The script when run, would ask for
1. 'input folder' (browse and select)
2. 'output folder' (browse and select)
3. final dimension required
Once run, will pick up all files in 'input folder' resize it and save it to 'output folder'.
Ideally you could run the script while leaving for the day, and get the output ready by next day morning.
And since this will be your script, you can run it as and when required, for the required size, on required number of images.
Why pay for manual labor, when things can be automated.
Want to know more? lets chat about it.