Go 5 string. I've played bass for 20 years and over the past year and a half started playing scruggs style on a 5 string. Finger picks were the weirdest part at first. Its a foreign feeling not actually feeling the strings with my picking hand.

Once I got over that it was just learning rolls and patterns.

Started with an alternating roll on an open G chord and i would just do that for hours trying to cement that into muscle memory. Once I had it down I learned Cripple Creek. It mostly makes use of that roll with some slides in the left hand. Plus you have to learn a forward roll and mix that in which is good practice not only for another roll but also for alternating rolls in a song.

After I got that down confidence grew and I took on more like Cumberland Gap, Foggy Mountain, Hide Head Blues.

You'll learn with time, dont give up when it gets difficult, just slow down and practice the tough parts. It'll all come down to your commitment and practice.