Hi Shreenidhi
You mentioned being an SD Consultant. There are lot of changes with S/4 HANA on the logistics side with 1511 release. Some of the early talks are available on the partner edge portal already and in case you are working with a SAP Partner, you should have access to the same. The help portal is already updated along with the simplification list
SAP S/4HANA, on-premise edition – SAP Help Portal Page
Additionally, there is an online trial edition offered by SAP for the same for 30 days. You can always try hands on.
One of the blog by Somnath Manna should help answer the basic functionality in S/4 HANA from logistics perspectives.
http://scn.sap.com/community/s4hana/blog/2015/07/13/expectation-from-simple-logistics
If you are good at SD, trust me adopting S/4 HANA should not be difficult. You should be clear in basic processes and be proficient in integration because the simplification has been around the integration part the most, for eg, SD with MM, PP, CO and FI. There is a lot of content available and picking up the required skill set should not be a problem. At the end of day, change is continuous and imperative.
Thanks & Regards
Sanil Bhandari