It's entirely possible, did it myself.
I have no domestic backup (ie don't live with parents or partner), you'd be amazed at what a difference it makes if you don't have to worry about sorting clean clothes out for Monday morning, shopping for food or cooking your dinner. I work a normal working week, plus additional voluntary duties that take me up to the hours you're talking about.
I did end up taking an additional unpaid week's leave in the middle when it got really manic with all the commitments.
Be under no illusions, it's hard work. But as Genghis says it can be done.I did it with CATS, which split the exams into three chunks. The benefits were that there was less to remember at any one time for each bunch, plus the brush up weeks were single weeks, meaning I could get leave from work no problem. Passed them all first time.
Good luck.