Pretty new to riding so don't know if this is usual, but sometimes I have difficulty shifting down into 1st gear.  I usually shift down to 1st at around 10 mph, and typically I can just shift down through neutral and to first.  But occasionally as I'm slowing to a stop, I cannot shift down into first, because I feel some kind of resistance (catching) on the shift.

This problem, if it even is one, happens more often when I come to  a stop without shifting to first.  Say I've come to a stop in 2nd.  I cannot, while holding in the clutch, go down through neutral to 1st.  What I have to do is:     I slow down to a stop holding in the clutch in 2nd.  While stopped and still holding clutch I try to shift down to first through neutral, but the shift pedal won't let me go through neutral.  It stops there, I have to release the clutch, and then repull it and go down to first.

I didn't know if this was my interpretting some sort of safety feature that stops me from going down into first too soon, or what.  Sometimes I can push straight into first, sometimes cannot.  This is really only a problem when I'm on an uphill at a stoplight, and I'm having enough trouble going without killing it without having to worry about how to get down to first in the first place, like I said, usually I can just release the clutch and pull it again.

believe it or not, can happen in any gear.
mostly going down and rarely going up.
usually happens to me when I'm on the low side of oil.
simply apply pressure to the shifter with your foot (well what else could you do it with, yeah read to many manuals)
and let out the clutch alittle just to the friction zone as you really don't want to go anywhere at the moment.  This should be enough to spin the gears alittle and cause them to engage.
in 1st you'll probably hear tic tic tic clunk.