the swap trick is easy, however if you just want to use that, you really should look at getting a 4 in 1 cart as well, it makes it a bit easier, and of course you need that if you don't want to patch all your games for whatever region your system is.
The 4 in 1 cart 'breaks up' the swap trick a little and gives you some more time to do it, as well as helping you to determine at what exact point to swap.
I've tried doing it w/o the 4 in 1 and it is still doable but it's a bit harder and sorta... I dunno... more frantic.
I've heard a lot of people say that swapping discs like this will evetually burn out the CD motor. Though I don't play my Saturn THAT often, I did play it quite a bit especially after I got Radiant Silvergun (tip, if you really want to see why this game is so great, do NOT play the arcade mode, as unlimited credits makes it way too easy, and you don't get to play ALL the stages), as well as a few other import shooters I found like Sokyugurentai, and have yet to have it do any damage.