<p>Some prints take a long time and, as I'm not in a workshop, I need to pause the print sometimes.</p>

<p>Are there any special considerations I should take when pausing, or can I literally just click pause, leave it for twelve hours or so, and it'll continue without any ill effects?</p>

<p>I'm using PLA at present.</p>

If you keep the head hot during the pause, and over the print, you will melt the material already deposited.
If you move to X0 Y0 (like on a layer change) and pause there, you can cool off the head (or not), but will want to prime (advance) some material before resuming your print - or risk an initial void, as the heated material will expand and drip to some extent.
If you move to X0 Y0, retract, and cool off for your pause, you should be able to heat up, advance, and resume with few issues. You will probably still need to some manual cleaning where the resume was, as there is likely to be some buildup.
Also, if you let the bed cool during your pause, your print may become unstuck from the bed.