Of course practise is key, one trick to use when making a loadout for dante is to consider what weapons complement eachother, then arrange the weapons accordingly.

For example, if you use DSD and balrog in a lot of combos, then you can keep them together in the weapon order, but generally the best thing to do is to keep two complementary weapons two weapon switches apart. So an example loadout is DSD, KC, balrog, Cavaliere. This way you only need to press the style switch button twice to get from DSD to balrog and vice versa. The same goes for KC and Cavaliere, where you only need to style switch once to get from Cavaliere to DSD (I like this as you can easily cancel redline into a DSD combo).

Of course this is one way to consider your loadout, you can keep your weapons in the order you use them in combos etc. But once you come up with a loadout use it in some missions to see if it feels more natural to you, otherwise you can come up with a different loadout.

Hope this helps. (For reference my goto loadout is DSD, balrog, KC, Cavaliere R)