I have a little personal bias because I grew up in HB, but I also think Huntington is more accessible than Newport Beach. There are almost no buildings on the sand side of Pacific Coast Highway, so there's no trekking through neighborhoods or private alleys to get to the beach.
I believe parking is up to $10 last I heard; harder to find the closer you get to the pier and downtown.
I would get on the 5 freeway south and then the 55 South. When the 55 runs out, continue on the street it becomes (Newport Blvd.) until it dumps you on Pacific Coast Highway. Then turn right (north) to go to Huntington Beach (or left for Newport).
If you are nervous about the freeways, just head west on Katella until you hit Magnolia and drive straight south.
Unless you want to be downtown near the pier and the buzz down there, any of the state-beach entrances (at the first few stoplights heading north on PCH) have all the sand and surf you will need!
If you Google-map it, reset the route to go down the 5, otherwise it takes you kind of a strange route, IMO.
PHXscuba
"You can't have everything -- besides, where would you put it all?"