Changing gear when pulling out

[SoupAnxiety]

When stopped at a T junction waiting to pull out, or stopped waiting to turn into a road, I've got into the habit of changing up from first to second mid turn. Is it better to put on extra revs and change up when the turn is complete and the wheels are pointing straight on the new road? In my driving lessons I was taught first gear is only for setting off, this is the advice which means I'm changing gear when I perhaps shouldn't be.

I've tried hard to write this up in a way which doesn't make it sound like a silly question, apologies if it is.

[SoupAnxiety]

Thanks for the replies. I didn't make it clear in my post but I'm not flooring it, the example would be stopped waiting to turn and then moving off when the road is completely clear. I'll try more revs in first and wait until I'm on the straight. It's the juggling of one handed steering, operating the clutch and trying to rev match. I'm doing it OK but it feels wrong - not smooth and considered.