YMMV, but seclusion doesn't seem to work for me... I can't be trusted with distractions, but it seems I can't be trusted not to seek the situations where I'm exposed to said distractions either. Taking the aforementioned example of going to the library and closing my phone, I'd probably leave early after convincing myself I could do the same from home, or pull my phone out of my bag and boot it up later "just to check something", and bam, back to square one.
Routines are absolutely key, though.