If you are right handed and plan to use a lever operated press, probably plan to install the press near the right side of your work surface - chances are good you will use your right hand to operate the lever and the left hand to feed components to and from the press. If you are going to use a balance beam scale, try to figure a place for it about eye level, when seated - becomes a real pain to trickle up loads when have to get face down to desk top level to see the balance beam marker line up. I do my case prep and priming on the space in front of the chair - to the left of the press. I prefer to use an RCBS Bench mounted primer, so I do mount and unmount it whenever I want use it - four screws.
I do not use a progressive press - I use a single stage and have never loaded for handguns. So, might be all different? But, if you plan to turn out 200 rounds in a session, need space to lay out the 200 components to feed the press - and a place for the 200 x finished product to go.
I think over time you will find your loading tools, loading supplies (bullets, powder, primers and brass), etc. will over take the actual space needed for re-loading operation. A bit extreme, probably, but 19 different die sets, 20 odd containers of powder, associated brass and a couple thousand bullets and primers start to take room to store in a way that you can get at them. Reloading for shotgun is way more bulkier supplies (wads and hulls, mostly), and if you get into bullet casting, another tote or two of "things", beside lead ingots, etc.
I hope you win your battle with the dog.
