@Longimanus - hope this helps a bit - hopefully this isn't too patronising, apologies if you already know all this.
Lee, regarding the final resizing, this is my basic workflow.
1) RAW conversion as per normal
2) Open the image in PS and do all the specific adjustments - backscatter cleanup, curves adjustments etc. but no sharpening or noise reduction yet
3) Save the file as it is - I save it as a .TIFF, others may use .PSD or similar.
I've now got my master file ready and it just needs finalising for whatever use I want. Normally its for web, so I'll try and show you below.
Here's a shot thats been saved as a Tiff. Ive now gone to Image -> Image size and you should see this box pop up.
View attachment 73203
I've inputted my size requirements for TP - 1024px on the long side and the resolution I'm choosing (72 used to be the standard but I've upped it to 120 due to 4k monitors)
First I click on the background layer (sometimes called Layer 0 as here), I then go to my layers panel and click on the little box top right which has 4 horizontal lines in it and a little arrow next to it.
View attachment 73204
Please note the adjustment layers are here as an example only, they show how may layer stack might look at this point.
I click on the 'merge visible' option near the bottom of the grey panel. That reduces the layer stack to the background layer only.
Next I use ctrl + J (cmd + J on a mac) to get a duplicate layer, and this is where I do my sharpening. It's difficult to show the over sharpening here, so I replaced the sharpening with a 3 stop over exposure as it's easier to see, but the steps are exactly the same. If you want to use NIK, then you can skip doing the ctrl + J step, as the Nik layer will automatically go where this duplicate layer would go.
View attachment 73208
I've applied the effect to the entire frame, then added a mask by clicking on the icon at the bottom of the layers panel which is 3rd from the left - a rectangle with a circle inside it. The mask is displayed as the right hand box on 'Layer 0 copy' here, and when you first add the mask all the box will be white. To work with masks you must always remember 'WHITE REVEALS, BLACK CONCEALS', so whatever inside the box is white will display the changes you made, whatever is black will mask the changes and the black areas will be unaffected. What I did here was do my changes (the overexposure instead of the sharpening). I then used a shortcut of ctrl + I (cmd + I on a mac) which turns all the box black and conceals the changes. I then choose a brush (shortcut B) and look at the panel on the left of the screen. Towards the bottom of all the icons are 2 overlapping squares, one white, one black. click on the little arrows just above the overlapping boxes to make sure the white one is on top and paint over the areas you want to affect. If you get it wrong, toggle the overlapping boxes so the black is on top and paint over your mistakes.
So, in reality, I'd only be sharpening my subject, not the background. (Please note I did my mask very roughly here just as an illustration - in a real shot I'd be a lot more accurate)
I then mentioned the opacity, I use this a lot. It has the effect of reducing the changes you just did to suit your taste.
View attachment 73213
If you look on the layers panel I've circled the opacity slider and reduced the opacity to 50%. This has reduced the overexposure on the bird from the previous screenshot by 50%. I altered the opacity by clicking on the word 'opacity', holding the mouse down and dragging it to the left. You can keep doing the adjustments until you're happy with your result. This use of opacity is what I find really useful when using NIK filters.
I then save my file as I wish - for here on TP I'd just export for web, using file -> export -> save for web, and set the max file size to 350k using the quality slider.
It's all a lot easier than it sounds, once you've done it a few times it'll take about 2 minutes and the results are really worth it.
I'm not the best teacher, so if something doesn't make sense just give me a shout.
Mike