It depends on the industry-sector you are; the expectations/scope set for SAP QM;
+ industry sector you are in...
if you are not in Devices/pharma industry (or industry w/o Regulatory purview...) then it might be simple story; otherwise its got its own dimension of validations, etc.,
Now, coming to the scope/expectations...
SAP-QM offers a fair amount of functionalities&features to map various QA & QC processes. Right from supplier qualification, specifications, First lots, Quality control processes (sampling, analysis, results, batch release), equipment maintenance, ...
you can visit help site of SAP for getting info on what sAP QM can do ... viz.,
http://help.sap.com/saphelp_47x200/helpdata/en/a6/df293581dc1f79e10000009b38f889/frameset.htm
http://help.sap.com/printdocu/core/print46c/en/data/pdf/qmptbd/ale_qm.pdf
Most of the QM-process can be automated through SAP; What needs to be determined is that, to what level does SAP-QM satisfy/match your documentation standards/practices. ( i.e., , flexibility/ease of re-engineering the processes for implementation ...it could be either you existing processes or your customizing SAP QM)
SAP QM claims (it does have) most of the features, (even says it has all Laboratory Information Management System features)
And the trick is to start getting used to SAP QM with easiest/simpler processes viz., Warehouse controls (material control/release, sampling, COAs, supplier controls..) then gradually keep adopting (configuring/customizing/re-engineering ) the processes one after other.