The talking to parents gets easier, you learn very automatic answers that just kind of pop out even when your brain is distracted lol.
That said, I occasionally still have those moments, where you are like 'Whoa, there was def a better way to say that.'
There are a couple techniques that have helped me, the automatic answer being one of them. A second is reading and reciting stuff over and over here on the board (Wendy is a great example of this.) A third is to be proactive... If you know there are questions patents will ask, answer them when your brain can focus on them instead of when you are distracted.
For me, it might go something like this: "Ok, your daughter is still under a year, so we're going to put her seat in rear facing. (Talk a bit about seat itself, ie, this seat can stay rf to 40" and 40lb our when her head comes within an inch of the top.) You might have heard the old school of thought which said kids can turn around at a year. The current recommendation is actually to stay rf to at least age two, or better yet the limits of the seat. The reason we recommend this is because kids' spinal columns can stretch further than the spinal cord can before it snaps, which can lead to whats known as internal decapitation. Lots of people are worried about kids' legs, but they're actually more likely to break ff than rf... rf they draw up towards the child on a crash, whereas ff they kick out in front of them and can strike the vehicle interior."
That takes care of a lot of the common questions, and also tends to tender comfort as a logistical question rather than an objection, since they are usually on board with erf. It's easier then to answer, "My kids haven't ever been bothered by lack of leg room... If you look at how they play on the for they sit in all kinds of weird positions anyways. They actually tend to prefer rf - in fact - we rf to the limits of my seats, so I just turned one little guy around shortly before his fourth bday. About a month after I turned him, he got really mad at me and asked why he wasn't rf anymore. I told him he was too big, and besides I thought he wanted to sit ff? and he said, "But I didn't realize how much I could SEE when I sat backwards!"
I know thats a long-winded answer but it's where I've found my best rhythm. If I can anticipate questions, then I'm less likely to get caught offguard and botch an answer because I'm distracted and fumbling for the right words.
A lot of it is just practice. I'm still learning (been cert a year) and will definitely have that moment where I kick myself because there was def a more effective way to get my point across. The good news is, most of the time I am critical of myself because I know there's more/better to be said, but allthe parents know is what I *did* say, and that's enough info for them to understand why it's important.