Some mentions of the Sabbath in the Bible won't tell you much of anything about how to keep the Sabbath because they're too literal. Remember all those times the Sabbath comes up in Acts that we skipped over because it's just "on the Sabbath this thing happened?" Well, the fourth chapter of Hebrews is almost on the opposite side of the spectrum: you'll barely find any guidelines or pointers on keeping the Sabbath because the chapter's so metaphorical. …Or will you?
Reading what Paul had to say about the Sabbath in his letter to the Colossians, I couldn't help but think of a verse from one of his other letters: "It was for freedom that Christ set us free; therefore keep standing firm and do not be subject again to a yoke of slavery" (Galatians 5:1). The Sabbath isn't meant to be a yoke or a burden; it's meant to provide freedom and rest. And if you intend to keep it, it defeats the purpose to load it up with so many restrictions that keeping the Sabbath itself becomes work!
Of course Jesus heals on the other six days of the week. But those healings don't draw heat like the Sabbath healings do.