There are several and relatively easy methods to reduce graphene oxide to graphene.
You may find usefull information in the following review articles:
1.S. Pei et al. "Direct reduction of graphene oxide films into highly conductive and flexible graphene films by hydrohalic acids", Carbon, Volume 48, Issue 15, December 2010, Pages 4466–4474
2. S Pei et al "The reduction of graphene oxide" CARBON 50 (2012) 3210 – 3228
Depending on your desired Applications and albeit a lot of people (untentionally or even intentionally) seem to neglect it, it can be very essential to remember that reduced graphemes oxide is seldomly (real or high quality) graphene.
Graphene in my opinion is unachievable, regardless of the reduction treatment performed there will always be some oxygen groups left. You can reduce GO to get rGO but not Graphene....
A simple method of reduction is annealing at around 400C...
To get graphene from graphene oxide is not easily achievable. Pure graphene is somewhat seems very challenging due to oxygen as impurity. High temperature annealing or use of highly reducing agents will result in graphene.