I will echo the advice, having run the gauntlet from a 50 cc Honda back in ther late '60s through to the FJR today.
Along the way I've seen people who have bought machines that are beyond their skill levels, and if the buyer's been mature, it usually ends well.
Having said that it is still prudent to get your chops on a naked bike, probably in the 750 cc range - an older cruiser or 'standard' should do well - no weather protection, but no plastic either and after a season or two you will have the knack and using the clutch will be second nature. Old bikes don't depreciate, so you ought to be able to recoup your investment when you are ready to move up.
As to complaints about the'07 (and 06) throttle; It is sensitive, but a steady hand does it well - I have had zero issues and would never complain based on what I have, but some of the members are sometimes like little girls B) and also some are pretty old and perhaps getting a bit feeble