Overdoing it for multilingual site?

I have a site with two languages. I'm trying to follow best practices to the fullest by:

1) Adding for English pages and for Spanish pages

2) Adding hreflang tags in each page. Example:

3) Defining the languages in the XML sitemap: domain/about

Am I overdoing it by applying all these practices on the same website? Would that cause any kind of problem, or this is actually better? Especially that I've seen articles recommended against using the hreflang on both the pages and XML sitemap together.