I use Lightroom (5.7) as the hub for all my photoprocessing. If I need to use Photoshop (CS6) or any of the Nik or Topaz plug-ins, I use them from within Lightroom.
So, when I need to export images as Jpegs for a competition, I hit the "Export" button, enter the image requirements in the Export Dialogue Box (let's say not more than 1400px wide and not more than 1050px high, sRGB colour space, not more than 2Mb file size, etc. (in fact I have User Presets for the commonly used exports).
To me, that is just so intuitive, simple and quick.
But I have now been asked how fellow camera club members who use Photoshop, but not Lightroom, can export Jpegs to those parameters from their processed images. Try as I might, I cannot find an easy and simple way of doing it. All I can find is an extremely convoluted "Image Resizing" function which will resize to the requirements plus a separate process to "Save As.." in which I could specify the output as a Jpeg file.
I am sure I am missing something very fundamental. Any clues?