Maybe the op wqould like to test aqemu, which is a graphical frontend for qemu
and it might be easier for him to configure.
In the comparision of aqemu (with using kvm) and VirtualkBox and Virt-Manager
my feeling was, Virtualbox the slowest and both Aqemu and VirtManager faster.
The latter two are were looking both even fast.
However, virt-manger IMHO still is not very user friendly, especially for
beginners, and also its documentation is not much at the moment. But please
be respectfull (or is considerately the correct idiom?): virtmanager is rather
new and has not many people involved, so it might become better in the future.
Virt-manager has great potential.
Wait what, new? It's from 2006 and doesn't seem to have received many feature updates since the first time I used it 10 years ago, mostly upkeep to make it work with newer python/qemu.
"still is not very user friendly", "its documentation is not much at the moment". I'm not holding my breath!