Clutch, who needs a stinkin clutch!
I usually don't even use my clutch except for 1st gear launches and turning corners...as long as your rpms match perfectly, it's not even needed.
The key to perfectly smooth shifts is matching your rpms.

Master that and your passengers won't even know that you're not driving an automatic.
For example: at 20mph in 1st, you should be around 4000rpms...at 20mph in 2nd, you should be around 2500rpms...
So shift outta 1st and into 2nd at 20mph...and disengage the clutch as soon as the rpms drop to 2500...and it should be smooth as silk! In order for this to work for you, you need a good grasp of your speed/gear/rpm relationship.