Honestly, they're not too bad to swap. You want to be sure to get a 2010/2011 MacBook Pro keyboard, as I've seen a few reports of issues with older or newer ones swapping over the caps. With a decent spudger, some patience, and a gentle touch the keys just pop right off. Sticking them back on is nearly as simple. The larger keys (Shift, Space, Return, Caps Lock, Tab, Delete) all have a metal stabilizer bar below them. The design was slightly different between the two keyboards (I swapped from a 13" 2011 MBP), but keeping the bars with the original keyboards worked. The new key caps snapped into the old bar just fine. It's just where they hooked into the keyboard below that was different. If you're interested, go for it! Keyboards are cheap to find on eBay, and it makes for a very visually-striking MacBook that I still get compliments on today
Also, why you're prying, note that for most of the keys you wanna approach them from the top or bottom to pop 'em off. The larger keys along the bottom row and the keys with the metal bar, approach them from the side. The scissor mechanism is vertical in those, while it's horizontal in most of the keys. See the attached pictures for details.
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