Question RE internet connections/routers

I have three internet connections: a cable connection, a fiber connection, and a DSL connection.

Each has it's own wireless router, and I connect to whichever is running best at the time.

I'm on the fiber connection most of the time, except for random days when it has massive packet loss, then I switch over to the cable connection, unless it's at 3-6pm peak time, when I'll use the DSL connection.

What I would like to do is to have just one wifi network, and feed all three internet connections in automatically, and let the router decide how/where to send the traffic, according to which is best.

From what I've read, I assume I just need a multi-WAN load balancing router?

What's unclear, however, is whether it's just auto plug and play, or whether I need a clever person to set it up?

Any advice would be appreciated.

You should take a look at this. http://speedify.com/ That looks promising, but it isnt free.

I was about to pipe my Wifi and 3G data card to make the maximum out of them, but realized that isnt free. Obviously, this cant connect to multiple wifis together. If you can connect the 3 networks using different mediums, Speedify can help. Like, one as a wifi, one as ethernet, one via USB, but I am not sure.

although i haven't set up a multi-wan router so far, only a wifi router with a cable connection (needed to configure DHCP), but i think you'll be able do it for yourself, if you aren't technically impaired, user manuals/live demos are available online before you actually commit to purchase, so you can decide for yourself, if you can do it or not
i just checked a company's website which comes up on 1st place on Google for the term "multi-wan load balancing router" and they claim, that even non-IT ppl can configure their routers with ease, you can access the router's admin interface via your browser and you only need to follow instructions from there