Your steps are good.
just few notes of my own, that other users might not agree with, so just make your own opinion:
that site is telling people to install a mix of cIOS :
cIOS 249 base 56 v10 beta53-alt
cIOS 250 base 57 v10 beta52
I wouldn't recommend it (for many reasons, already explained few times in multiple threads).
if the user want multiple cIOS (like most guides tell users to do) just keep the same revision for both slots : v10 OR v10-alt, not both.
249 : d2x base 56 v10 (NOT alternative, the r52 instead of r53)
quick explanation :
slot 249 is setup with r53, which is used for USB 1 support but lacks emuNAND and has some game incompatibility. plus, it's using base56 which doesn't work with all games.
if you need a base 57, or emuNAND support, you'll lose USB Port 1 support, which you shouldn't have use in the first place.
If you really wanted USB Port1, you'd better install base57 with r53, but should know that emuNAND might not work with your drive, and SD support is not good (Wiiflow supports Wii games on SD, but only with r52)
so, the website setup is fine, as long as you set slot250 as default and only use USB Port0. but why not just install the right IOS in the default slot?
the best setup would be :
249 : base 57 d2x v10 (or v8 on Wii, it's the same), not r53.
And that's all you need.
only one game requires base 56 as far as we know : Spiro's gate support. (the game works with IOS57, but not the physical USB addon device)
so, you can install base56 in slot 250, and set only Spiro to slot250, all other game would use the default IOS249 base57.
The best setup is not the one which is identical to everyone else, but the one you understand WHY you do it.
I'm recommending users to install v10 (r52 instead of r53) but maybe some users have specific needs like USBPort1 support (especially on WiiU where they want multiple HDD at the same time), in that case r53 is the one to use. maybe you'd like base56 instead of 57; or even base58 for whatever reason.
Personally, I don't tell users to use that website, but provide a pack of already merged d2x data + installer. Because a lot of people don't understand what to do with multiple files to merge in the same folder.
here are a set of installer:
d2x installer full pack (v6/7/8/10/10alt) for Wii
d2x installer full pack (v10/v10alt) for vWii
These packs are only missing a modded version of v10 r52 which supports emuNAND with Ustealth drive, so it's not really "full pack" as there's a missing, and less known, version.
I wanted to make a single pack for both Wii and vWii, but I'm afraid people would mix them and install the wrong version.
Latest nintendont has new settings that the official "latest" USBLoaderGX doesn't have yet.
Greywolf made a version with these new settings. You can find it in the USBLoaderGX first post.
But I understand you find it easier to redirect people to already existing website and guide instead of telling different things one by one.
Or maybe you could make a tutorial of your own that you provide to your friends with these links and files hosted all at the same place.
if you want to make the steps easier, you can just provide my packs instead or telling users to grab the d2x installer and d2x data themselves, the pack is already merged. they just have to extract to sd:/apps/d2x_installer/ folder
Like I said, that's your own choice. your overall steps are fine.