Ooohh me, let me answer this one please!!! That's one of my favorite tools! End grain is about a bajillionmilliongoogle times easier to cut with a (sharp) low-angle block plane. Seriously - a sharp block plane will do the job, but with a sharp low-angle you practically just wave the plane in the direction of the wood and shavings will curl away in fear. If you've been dissapointed by tools in the past, a good low-angle will restore your faith. The only problem is you'll end up wanting another one to have a sharpened spare, and then a skew for even easier work, and before you know it you've got a dozen and they're calling you a collector.
Insert witty signature line here.