Blues Shuffle

your index and thumb, use the pick and your middle finger

4 Times (I)
e----------------------------------| 
B----------------------------------| 
G-----------4---2--1---------------| 
D----------------------------------| 
A--2-2------5---4--2---------------| 
E--0-0-3-4----0--------------------| 

2 times  (IV)
e----------5---3--2-------------------| 
B-------------------------------------| 
G----------5---4--2-------------------| 
D-2-2--------0------------------------| 
A-0-0-3-4-----------------------------| 
E-------------------------------------| 

Back to (I twice)then;

2 times  (V)
e--------------------------------------| 
B-----------7----5--5------------------| 
G--------------------------------------| 
D--4-4------7----6--5------------------| 
A--2-2-5-6-----------------------------| 
E--------------7-----------------------| 

Back to (IV twice) then (I twice) then the turnaround
e-----2-----| 
B-----0-----| 
G-----2-----| 
D-----1-----| 
A-0-1-2-----| 
E-----------| 

Then start the progression over again