How hard is it? That is not a quick question. A lot of people start reloading to get the most potential out of a rifle. That takes a scale, a caliper, a single stage press, a set of dies, some case prep tools (case trimmer, lube pad, lube, primer pocket cleaner, maybe a tumbler), a powder trickler, and a couple reloading manuals (please forgive me for stuff that is forgotten). Supplies would be brass (which you might have already collected), primers, powder, and bullets.
But you mentioned pistols. Single stage presses are not very fast, so then you are talking about progressive presses and shellplates in addition to most of the stuff above.
A very quick wag would be $300-$500 for single stage, $500-1000 for progressive (depending on the color of the press
). My press is red, some people like green, quite a few swear by blue. Understand that tons of the price is the accessories, and you have a range of price on most of them. I love my $100 tripple beam - but you might be fine with the one that cost $20. Likewise you might like a digital caliper (that costs $100, while I am using a $10 dial caliper.
As for easy, everyone and their dog appears to be getting into this right now and it is all but impossible to find a lot of the equipment in stock on the web (blue may be an exception).
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Also understand this one simple fact. Reloading will not save you 1 cent in ammo cost - you will simply shoot more.