Best way to learn SAP BI

Hi

I am a Business Objects Professional and have around 3.5 years of expereince in BO,Crystal, BI/DW.

Now I want to upgrade my skill set by learning SAP BI.

Could you please guide me on following points.

1. Whats the best way to learn SAP BI

-- Training

-- Self Learning

2. Is there any SAP evaluation version which i can use to learn SAP BI If Possible can u share link.

3. Recommended Books for a beginner.

4. Would it help me to increase my skill set value after learning SAP BI or Should I continue on BO

--Kuldeep