Anyone got any advice with versing a larger opponent, using wing chun? I'm kinda lost on how to "bring them down to your level". I would ask my teacher but I stopped because of school...

Kick them in the knee, doesn't matter how big they are they will go down if you kick them right. For big people attack the vitals only or you risk losing bad. Go for knee, groin, eyes and throat.

Rico.

How would you kick intro of the fight? Straight away to the knee as the opponent steps in to attack?
Most big people are like "immune" to those attacks sometimes...I've tried those but it's discouraging when there's no reaction to the attack I do.

I have this really big guy i sometimes spar with. You cant to a bong lap fat to them because i cant reach him in the first place. And i am 6 foot! imagine how tall that guy is! anyway, the other guys are right, the only way down is their knee. The thing is that you cant do that in sparring cause you might break their knee but in a street fight situation, shoot out a biu jee (thrusting fingers) and at the same time do a stamp kick on their knee and instead of drawing the leg back, step through and land on the kicking leg, then you will have also bridged the gap and you will be in the optimum wing chun position (right in their face).
If it is in a sparring situation then..... i m not sure, you could step 45 degrees forward and get them with floating ribs?
If its a sparring situation, then try lots of different things every time and see what works for you, maybe even a simple arm trap?

Kicks to the knee are easily avoided,blocked, or countered and they won't go down like in the movies.

The groin,eyes,and throat are easily guarded vital targets.It's natural to protect these areas with no training at all.

Sanchin: So what do you suggest?
You are right its not like the movies, but is someone is just tall and big but is untraind he will not be able to defend his knee especially if he has his weight on it. I have tested this.
If he is trained then i still think a move that distracts would leave his legs open for an attack.
So what would you suggest, i would be very interested to learn a technique so that i can vary it up a little with my sparring partner.

During sparring a shorter person needs to keep his own range.Either stay outside his range or inside close and throwing strikes.Yes,you could fake high go low or visa versa.The knee has to be attacked with the weight on it as you stated,but only from certain angles which you probably know.
For self defense it wouldn't matter the size.

Empty -

Fighting bigger guys can be a problem. I don't suggest breaking your sparring partner's knees in practice, but MAGr had a good suggestion to use your kicks to close the gap. I personally prefer low kicks to the shin or Thai-style roundhouse to the thigh.

Another good trick is to learn to step on the opponent's lead foot. This will make it difficult for him to kick or move while you enter.

Use circular footwork to go around the taller opponent's longer limbs, and attack from angles, not dead on.

Practice!

Anyone that says kicks to the knee arn't effective is wrong, as for the groin eyes and throat most people have flinch reactions to defend these but nothing more. They are easy to strike and will put anyone down if you are trained to hit properly.

Rico.