Just as the armor of God is a gift (there is no way to earn it or manufacture it), praying in the spirit is a gift (see 1 Cor 12 - 14). We can ask the Father for it and receive it as long as we will be responsible for using it. We must be diligent in using whatever God gives us. I think praying in the Spirit is the only way we can "pray always" or "on all occasions". With practice we can train our subconscious to pray in the Spirit at all times.
What about "with all kinds of prayers and requests"? I often think my prayers are not big enough. I don't have God's vision for the big picture - and I should. We know that God wants all people to be saved (1 Timothy 2:1-5). We can pray for the safety and salvation of entire countries, or certain populations, or even towns.
For reflection: What area or what people is God laying on my heart for prayer? Is it a nation, or people who suffer from a certain illness, or refugees, or a religious denomination?
Let us pray. Father, I open myself more to your Spirit. I open myself to praying in the Spirit. Lead me to pray as you want for what you want, to join my vision to your vision, to see as you see, to love as you love, to bring about your kingdom on earth as it is in heaven.