when i first started i was only riding about once or twice a week, and it took me a good 3 months before i had enough guts to get on the freeway... and, yah- initially the wind was really difficult to overcome. i felt like i was going to get blown over, and i was so afraid to turn my head... <lol>
so, i would just practice going 45+ on a long straight-away city streets with little to no cars. and, then eventually i forced myself to do short 1 exit freeway runs to gradually get used to it. after about a month, it started getting easier. the more comfortable i'd get, the longer i'd go. so from 1 exit to 2 exits, to 3 exits- until finally i had the guts to go for like 20 minutes...
the best way to practice is to go on sundays when traffic is light, and pick a freeway that's wide open, and with good visibility. it really helps a lot. the other thing too is to make sure that your gear fits snug. if u have a jacket or helmet that's too big, it's going to give you trouble on the freeway- esp at high speeds. your helmet should feel "glued to your head," and your jacket should -not- be flapping in the wind.
bottom line is keep at it, and in due time you'll look down and go, "huh, that was 85? damn i swear i was only was going 55..."
<lol>