The following steps are not necessarily sequential
One of these all-important preliminary steps is that of learning to walk in heavenly places in Christ now. If ye then be risen with Christ, seek those things which are above, where Christ sitteth on the right hand of God. Set your affection on things above, not on things on the earth. (Colossians 3:1,2)
How are we living now? If we are seeking the things that are above, if our attention, our love, our interests, our hopes, continually are focused on the Throne of God, on Christ who is at the right hand of God, then we are attaining to the spiritual dimension of the first resurrection from the dead.
But if our attention, our love, our interests, our hopes continually are focused on eating, working, playing, reproducing, buying, selling, scheming how to get rich and find pleasure in the things of the world, then we are not attaining to the first resurrection from the dead .
We may refer to the name of Christ from now until He comes. But if we do not do what He has commanded, then the first resurrection, the resurrection unto life and glory, will not be a part of our future. All the theological discussions in the world cannot change the smallest aspect of the spiritual realities of the Kingdom of God.