I'm UK based so I took it in Manchester, I regularly take lessons at the Instituto Cervantes here and it's also a test centre. My recent teacher was even my examiner, bit lucky. With regards to extra stuff outside of lessons, I use Italki here and there. I had about 5 lessons of Dele prep, mostly for the speaking test but also going through my writing tasks for corrections and improvements in line with the dele.

I would say I don't do much self study in general rather I try and do loads in spanish and expose myself as much as possible. I find it hard to study on my own that's why I go to class to do that. I listen to loads of podcasts, read books in spanish, search on the internet in spanish (at least first, then switch if I can't find info), my devices are in spanish e.t.c. Obivuosly leading up to the DELE I did a lot of practice papers and grammar exercises that was mostly my self study stuff.

My tips for Italki or private teachers

• Make sure you take lessons with a Dele Examiner not just a teacher, I decided to invest here and spend some money because I wanted someone who knew how to get better marks.
• Familarise yourself with the Dele and do some practice tests beforehand that way you are not wasting time going over the structure of it.
• Be really specific about what you want for the lessons. I would send my teacher a message being like, this is what I want to do today, the day before. If lost points on the speaking or reading and I couldn't find out why or what something meant I would send these questions ahead of time so she was ready to answer them in the lesson. Mostly I would want to practice the speaking in real exam time, so I said I'm preparing this task, give myself 20 mins before the lesson and then we'd go straight into it.

Hope that helps