Steering with your feet takes a bit of getting used to, but it will come with a little practice.
The other thing that early-stage students struggle with is the use of the throttle. Since the engine isn't connected to the wheels there is always a time-lag/mis-match between the power you apply and the speed with which you move. You'll have noticed, I expect, that you need more power to get moving than you need to keep moving. And that if you taxi uphill, or across a step in tarmac, or round a tight corner then you need more power, sometimes quite a lot of more power. You have to learn to apply the power for as long as you need it, and then back it off as soon as you don't need it any more.
The most common mistakes that students make are:
Taxing too fast (on grass, never taxi faster than you can run).
Not keeping an eye on the wing-tips. They stick out a long way each side.
Taxiing with the brakes partially applied.
And not protecting the nosewheel/propeller when you taxi over rough ground or taxi from grass to concrete or vice versa. Keep the stick fully back and go carefully.