Big Love Help

[BlueGrass]

Hi, I got all the parts to the song down; like the main rhythm, the bass parts and solo etc, but I am having trouble putting the rhythm together with the bass melody.

As you know these are 2 different melodies going @ the same time. I am having a lot of difficulty playing it with the bass parts. I just can't do 2 @ once, lol. Even trying to practice it is hard. When I start I do the bass and once I try and do the main melody I can't keep going with the bass. My fingers just stop, lol. It is a mechanics thing, my fingers are not use to doing 2 different things at the same time.

I hope I didn't scare anyone but does anyone have any advise on how to beat this problem?