Go through the tab first to make sure you can it properly, and get familiar with the song here:
As you can see the excerpt relies heavly on just two strings. Instead of using all my fingers to play the tab, I just focus on using one mainly. To achieve this, just slide your finger your currently working on, down the string to hit the necessary notes. The strength needed to bend the strings while hitting the notes builds up the strength in your fingers.
Now my Pinky is one of the strongest fingers of my fretting hand - and the rest of my fingers are benefited with better accuracy and strength when playing licks or solos. Enjoy cracking open nuts with your harda-s pinky!