you can do it two ways, you can cover all the strings but the second and without picking just hammer and pull off on the notes, or you can simply alternate pick the second string
1980 Gibson SG Standard Cherry Red
Ibanez TM-71 Talman Artcore Semi-Hollow
2003 Tom Delonge Fender Strat Seafoam Green
Traynor YCV40
I just plug it into me amp, put on overdrive, and then just hammer-on each note, and if there's enough gain, each time you let go, it should pull-off without actually pulling-off...hope that made sense
There's really no other way besides hammer-ons and pull-offs so start slow and later on, increase the tempo.
It makes for a great alternate picking exercise..learn to play it a few different ways..
It is only hard when you start out, I assume you are a very new guitarist, and tapping/pull offs are very new in your vocabulary. Once you get the hang of it, it becomes very easy and is a great warmup.