TV ... Sam answered your same questions in the PCI beliefs thread ....
Here it goes again ...
1. At salvation/regeneration/justification Jesus comes into a person's heart as the Holy Spirit/Spirit of Jesus Christ/Spirit of the Lord/Holy Ghost. He is Christ in you the hope of glory.
2. Baptism in the Spirit is an immersion/overwhelming/saturation/empowerment experience in the Spirit subsequent to salvation
At salvation, the Holy Spirit comes in and takes over and transforms the individual. This is living water within according to
John 4 and drinking from the well of salvation according to
Isaiah 12. The HGB (Holy Ghost Baptism) is rivers of living water flowing out according to
John 7:37-39.
At salvation the Holy Spirit comes in and is like a pilot light (for you who are old enough to remember that term). At HGB the pilot light becomes a flame, energizing, anointing, and releasing gifts in us.
John chapter 20 was a maternity ward. Acts chapter 2 was a bapsitmal tank.
It has been described this way.
Imagine an empty water glass and a pitcher full of water on a table.
1. Lift the pitcher and fill the glass. Set the pitcher back on the table. The glass is full of water. This represents salvation/regeneration.
2. Pick up the glass full of water, and gently lower it into the pitcher of water until it is sitting on its bottom in the pitcher. Now the glass is not only filled with water, it is also submerged/immersed/saturated in the water. This represents the Holy Ghost baptism.