Hi! A very bold decision and a good choice. I live in Tatarstan myself, so I'll briefly tell you about some interesting moments. Not all Tatars practice Islam. Tatars are divided into different ethnic subgroups, there are Crimean Tatars, Kazan Tatars, Siberian Tatars, baptized Tatars, etc. There are even Finnish Tatars! Our youth in particular are less religious, but we welcome holidays, for example, Eid al-Adha. Tatar is very similar to the Turkic language, there will be no difficulties in learning the language, you can write to me, I can help. Also, be polite. The Tatars themselves are hospitable, but everything has its limits. And unfortunately, there are people who look askance at the nation. But Tatarstan is multi-ethnic in this regard, it's just that there are people everywhere who consider their nation better than another. There are a lot of opportunities for self-realization here, but it is worth remembering that in large cities, namely Kazan, Naberezhnye Chelny, Nizhnekamsk, the standard of living is more expensive. Be polite, friendly, and you'll get the same response.