Do not worry, I won't hold it against you. But the thing is, AV isn't that complicated, especially compared to other forms such as Single Transferable Vote and such. AV would simply be listing your candidates in order of preference, and if nobody gets enough first preference votes the candidate with the lowest gets eliminated, and then the round starts again until one candidate can get at least 51%. It might not be the first choice of everyone, but it's a candidate most people can agree on.
In fact, in local elections and the French Presidential election, they didn't even bother with rounds, they just sent the two highest candidates to the next round and got rid of everyone else. It's not difficult, especially if you kept it to voting for MPs. Labour and Conservatives are only opposed to this system because it wouldn't help them, they benefit from FPTP, while the Lib Dems, SNP and Greens etc. would benefit from it and are more in favour of it. You wouldn't bite the hand that feeds you, and as such the two main parties wouldn't even think of introducing anything else.
But the reason why AV didn't get through partly lay down to the lies of the No campaign. They depicted it as a case of whoever gets in third place is the winner by having an advert where a horse came third in the race but won. They also had someone try to explain it to a classroom but everyone got confused, even though they were teaching it incorrectly. They were basically complicating the whole thing and making it out to be something it wasn't. It's like having a creationist teach evolution: they don't understand it or blissfully refuse to acknowledge it's true nature because of their own agenda, no matter how wrong they are.
As for the Swiss system, it's a direct democracy, but it doesn't end at voting. If legislation gets more than 50,000 signatures opposing it, a referendum is ran, and the fate of the legislation rests upon the voters. They even rejected EU membership through referendums, and in fact they also tried to impose a quota on EU migration. Nevertheless, it didn't work because it would violate the bilateral treaties it currently holds with Brussels, which included the free movement of people. Switzerland is basically ran by the people, so much that it doesn't actually have a head of state and is one of the few directorial republics left in the world.
I'll be honest as well, though I originally voted to leave the European Union, and am still very much Eurosceptic, I don't think the referendum was done for the right reasons. Not to mention, it divided my family a bit, and I am in fact the only one in my household who voted that way. So to be sat there watching the results in the morning when everyone was displeased wasn't the most comforting feeling in the world. What would I do now? I'd spoil the ballot paper, because the team behind our negotiations are frankly rubbish, but I do not like the European Union, and I also refuse not to vote. Least spoiling can be seen as expressing distaste for the system.