Firstly download my PSD template:
https://www.upload.ee/files/12991880/LS-RP.psd.html
Then download my action script:
https://www.upload.ee/files/12991894/LS-RP.atn.html
Open the LS-RP.psd file, this should give you a nice size of 845x845, as well as some nice rulers to keep things aligned properly.
Now go to Window > Actions.
You'll see a new panel appear, it's probably empty. Go and run my LS-RP.atn file, and you'll then get a new option inside your Photoshop action window. Expand LS-RP, double check 'Grab text', and assign it a hotkey. I use F12.
Now, all you do is drag your screenshot into a new tab. Ctrl A (select all), Ctrl C (copy), close that tab, and Ctrl V (paste) into the template. Feel free to move it around. The quality will be fine now, not like when you drag a screenshot in and it gets resized and looks shit.
Grab your /blindfold'd screenshot, drag it into a new tab. Ctrl A (select all), Ctrl C (copy), close that tab, and Ctrl V (paste) into the template. Drag it to wherever you like. I usually whack it into the top left or bottom left, against the rulers.
You can use the rectangle selection tool to cut out text you don't want.
Done. Save/export it as you'd like.
Professional Demonstration:
People With AutoHotKey:
Because I'm amazing, here's a bind that will set your pagesize to 20, /blindfold, take a screenshot, and then revert you back to normal page size, and removes the blindfold.