Having done this myself, one thing I did was work at certain desks in the stacks at my college library that happened to have metal walls. This acted as a Faraday cage, blocking all wifi and cell phone signals. It was very helpful for focus, while a the same time allowing me to easily access the internet if I needed to look up a paper simply by standing up and walking out of the work area. You may not have something similar, but the key issue of removing easy distractions like phones and especially the internet is very important.
Similarly, I would suggest not using your personal laptop to do this--it's another way for distractions to creep in. You'll want something that can download papers, compile TeX, and pretty much nothing else. You may be able to get a loaner laptop from your department for work purposes or get an old used laptop for cheap.
I also heavily relied on copy and paste from my previous papers, and even some of my advisor's papers. Obviously the sections from my advisor's papers had to be rewritten, but it gave me a complete draft, which was a big change psychologically. Having a complete document that needs lots of revisions is way different from having an incomplete document, even if the amount of work left to do is similar.
One last thing--keep a regular sleep schedule that gets 8 hours of sleep and involves waking up before 8. This is something grad students are notoriously bad at, but you'd be amazed at how much better you feel.