I need to build small scale without keypad scrolling text display by using PIC starting from PIC16f676....
I have seen it working as scanning from left right like that.
If you start a design out with very little RAM and only 14 pins you will have problems.
If is much batter to start out with some extra pins and a part with too much RAM. Many of the PICs have parts that are pin compatible and have three sizes of RAM and FLASH. Start out with the big part and after it is working look to see what it takes to use the smaller part.
Do not start out with the small part and when it is not working wish you had the bigger part and there is no pin compatible bigger part.
The software is not hard, very similar to writing code for a graphic LCD. But like ronsimpson says you will need more RAM, especially if you want to do scrolling text without writing very complicated code.