EHP 7 upgrade from 4.6C - CU&UC

Hi All,

We are planning to perform a upgrade in our landscape,our current environment is running with the SAP version as 4.6C NUC

As per our plan our Target release is ECC6.EHP7 with Unicode Conversion,what will be the best approach to do this successfully in landscape.

OS version  : AIX  6.1.9.30 

Database Version :"DB2 v9.7.0.7"

Which tool I can use for this if SUM which SP level

Thanks in advance

Regards,

N