For those of you who don't here's the basics, if your still confused, read through hydrus's documentation, its outdated and some of its incorrect, but its well written and I HIGHLY recommend reading through it all
Install
First, download the current version of Hydrus, for this guide im going to use the Zip version for windows, if you are on linux, you can probably figure it out yourself smartypants
Download the latest version first, usually the sticky on /hydrus/, currently its >>>/hydrus/946
Then download the latest database, this will save you over a days worth of time, you don't have to do this, but it will be a good 24 hours to download the tag repo, at minimum, the latest one can be found here >>>/hydrus/811 use the mediafire link
Unzip the hydrus client, naviagate to the hydrus folder, then to db, drop the contents of the client database zip into db
Running
Navigate back to the hydrus folder, click client.exe, and you hydrus should start.
give it some time to update, there will be new tags it needs to download Desu~Congrats, your hydrus client is working.
Install Desurepo
On the top menu, click "Services" then "Manage Services" in the drop down.
Click the "Remote" tab, then click "File Repositories", now hit "Add".
Enter the services name (Desurepo), then click "The account is already initialised; I just want to add it to this client Desu~I have a normal access key."
In the credentials section, you are going to enter the access key followed by the hostname and port, all can be found in the post above (you can just copy and paste it into there)
Hit test credentials, and you should get a message about how its working, hopefully.
Congrats, the desu repo is now set up, give it several hours to download all the images
WARNING
Much of the repo is still unsorted, and includes raw tag downloads from pixiv, this means, there is some very NSFW stuff in there, ranging from just lewd stuff, to very unpleasant, nasty guro, or even worse, furseiseki Desu~You can add -guro, -scat, etc to your search to filter out these results when browsing your images, however much of them are still untagged Desu~If you see any of these images, please tag them appropriately.
Once we have these sort of images properly tagged, we can begin removing them from the repo, or tagging them in such a way they wont pop up Desu~Hydrus dev is working on a global filter option, so after the next update, you should be able to set things to always be filtered out.
Lets use the tag "NSFD" (Not safe for desufags) for anything that fits the category of scat, watersports, guro, jissou (tag with jissouseiseki as well), and furseiseki (tag with furseiseki as well)
It's important we tag these, THEN remove them, so any desufags who do any batch downloads of any websites, will be able to filter out and delete these form their hydrus databases, since they are already tagged in such a way they can be removed quickly.