How do you know what you heard is from the Lord.
Practically speaking, what God tells me to do is usually the opposite of what would be self-focused. For instance:
(1) when I was being verbally attacked and lied about by my x-wife, I cried out to God and asked if I could leave. I honestly didn't see who it was helping for me to stay. My kids were seeing and hearing her abuse and hear her threats, people were questioning if I was like those people who talk a good Christian talk but inside the home are abusive. She even told me she contemplated poisoning my food. She was that determined in trying to get me to leave. God said "no!" So, I didn't; but I certainly wanted to. She eventually did leave and filed for divorce. God told me to give her everything and take on the debt. Again, not what I would have wanted to do.
(2) when God told me to go to New York City and "be homeless for 10 days", it certainly isn't something I wanted to do. Even when I got off the train, I was sitting by a support in the station wondering what I just did!!!! And a police officer didn't let me sit there more than 5 minutes, before kicking me and telling me to get out of the underground station. And, as I was walking around the streets of NYC trying to find a warm place to cuddle up for the night, I was REALLY wondering what I got myself into. After all, I had a nice warm apartment back in Harrisburg, PA, that was paid for. I wasn't really homeless.
(3) As a houseparent (currently), I told people that I would absolutely never take my family over to our emergency boys cottage and if they assigned me here, we would leave. Well, God told me to propose something that I would have considered insane which included being on all the time (except for two weeks vacation a year with no change in pay--we had been working week-on-week-off). We gave up our off-time, we are on all the time, and we are managing the emergency cottage where the most troubled boys come. Who does that? Well, God has blessed it in so many ways. More than one historic first (meaning never been done here before) has happened since God moved us over here!
(4) When I was in pharmaceutical sales, I used to leave a company when I didn't feel that my job was "safe" and I would get a pay raise to move to each new job. Well, with my last employer, a big company, I was in one sales force and got recruited by another. My boss's boss tried to block it. The leader of the sales force whose manager was recruiting me went political and outmaneuvered him, making him look bad and she got me on her sales force. A few years later, the now demoted boss's boss was about to become my new manager in a consolidated sales force. In my old thinking, I would have bolted. I certainly didn't feel safe. But, God had woken me up while I was on the other sales force. And, God told me "stay". So, I did. And, God rewarded me with my only "#1 sales rep in the country" award of my 13 years in pharmaceutical sales.
Can you say that you are going to heaven?
On our side of the Christian theology, we believe we are going to heaven, if we are living in and through a relationship with God through Jesus Christ and the Holy Spirit, because the "Holy Spirit confirms to our spirit that we are children of God" (Romans 8:16) and "sealed with the Holy Spirit" (Eph 1:13-14) therefore "absent from the body, present with the Lord (2 Cor 5:8), rather than because God tells us "congratulations, you are going to heaven!"
I think the more amazing promise is that we get to know The Father, and the One He sent (Jesus Christ), according to John 17:3 and that some day we will know as fully as we are known. (1 Cor 13:12)