the book “heaven is for real” is a work of fiction. NDE’s occur, but that one was clearly fiction
The best advice I have seen regarding spiritual experience is to test it by something veritable.
What is more veritable than the personal experience?
The MEMRA, the Word of God.
That is one reason for studying Scripture. By studying Scripture while in fellowship with God, we are in the right place, at the right time, doing the right thing, in the right manner, allowing Him to sanctify us in the graceful, just, and right manner He has Planned.
Let God provide.
If God provided the spiritual experience, He will edify us in His fashion by His means, which to not contradict themselves.
If our spiritual experience is contradicted by what He provides us in His Word, it glorifies Him to have faith in His Word before our experience. If they reinforce one another, then it also glorifies Him to have faith in His Word.