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I've read it's as simple as replacing a light switch (which I can do)
I want to replace a bog standard dial one like this:
http://www.plumbnation.co.uk/site/honeywell-dial-setting-room-thermostat-t6360b1028/?gclid=CLy1l6nK6MECFSHHtAodoT8AIw
With a programmable one like this:
http://www.theunderfloorheatingstore.com/prowarm-digital-programmable-remote-thermostat---white-or-silver-3974-p.asp
Any gotchas? Or still simple, turn off power and wireup?
Very easy. Though depending on your wiring you might need to add a link between the live powering the thermostat and the switched contact. And if you have a programmer it'll need setting to "always on" or the thermostat will power off with the heating.
You can get a Honeywell programmable thermostat that takes batteries if this causes a problem.