Are you asking if an OEM installation is more difficult or risky than a retail version? If so, in practice no, there's no difference between the two in terms of Windows itself. The only difference is in the license (OEM can't be transferred to another computer, retail can for example), and support (e.g. retail Windows has phone support from Microsoft for installation troubles, OEM doesn't). Again, in practice, there's seldom much problem with the basic install, and support from tech help sites like BC can assist if there is.
Precautions will be the same for both OEM and Retail, such as confirming Windows 7 drivers are available for the system it is to be used on.