compact compatibility

Currently running SRAM Force 52/39, I need to change to compact, how do I know what chainset is compatible? What do I need to look for? What does GXP BBNIB ISIS English etc mean? Could anyone explain which specs are relevant and what I should look for? Is it a big job?
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Provided you have the correct tools they are straightforward to fit. You will need to lose a link from your chain and to lower the front mech, but instructions for doing this are on the Park Tools website or anyone here can advise you.