Please, please don't ever be afraid to talk to the ATCU on VHF, licensed or not! Even if you're not squawking, it is far safer for all concerned if we at least know you're out there. No matter what class of airspace you're in! A quick position/alt check at the right moment could mean the difference between happy flying for all concerned versus fresh grundies required all-round and a barrage of CA1261 and AIRPROX reports landing on some poor sod's desk in SRG!
As already mentioned though, it can be a good idea to keep your message succint - there's nothing worse than a free-caller trying to pass his/her life story in the first transmission and clogging the frequency at the most inopportune moment!
Aside from that, good luck with the flying, and enjoy!
