Yes. u can do self study. but it will not b helpful. pre-requisite Training is must.
let me tell u SAP software is very heavy. u can imagine its size. when this software install u must have at least 400 to 500gb hard wid min 4gb ram. after installing it will cover 225 to 250gb space from ur hard. and during its installation it require 2 weeks continuously. then after u have to make its user name and password. wid out user name and password it wont b helpful.
For more info see in youtube.com
if u pass its exam and got its certification and have min 2 years experience u can get 4 to 5 lak per month in Ireland. as one of my friend is in Ireland. he came to pak n doing this course. min salary in Ireland is 45 to 55,000 euro per year.
or u can get private tuition from SAP certified person . but u have to find sap certified person and that person will charge u around 60 to 80,000.
so if anyone wants and cant afford 4 to 5 lak for 3 weeks training. then private sap certified person is best option.