You need to hire a plumber to properly install a new toilet. There are many issues that may arise if you try to install it yourself. Make sure you know the requirements such as shutting off the water before doing it.
The time it takes to assemble and install a new toilet is about one hour.
When you purchase a new toilet seat, it is going to come with the instruction manual as to how to install the seat, when you get it in your home for installation.
A lot of money.
Yes that's what the flange sit on and get bolted onto that is why if you remove the toilet/flange you will see a hole in your floor
You can install the vanity first. Then, install the tile up to the vanity and around the pipe for the toilet. Then, install the toilet. That way, you do not have to replace the tile should you ever have to replace the toilet.
Yes, you would indeed need a permit to install another toilet. They are easy to get.
No, toilet seats are not hard to install. There are two bolts that go through the rear of the opening on the toilet and when these bolts are secured, the seat is installed.
remove and install a new filler valve and get a proper flapper for your toilet at a plumbing supply
The toilet itself is easy to install but the plumbing would have to be rerouted by a professional. You just drill the floor and it's 2 bolts.
howtoinstal anewtoiletflange
there are several flexy toilet conectors available to buy so a toilet can be fitted in any position provided there is room for it
Toilets are usually sold with all the necessary materials needed for installation. It is fairly easy if you read the manufacturers manual. It will help if you have a friend to help lift the toilet. Some people like to seal the toilet with silicon at the base of toilet so it doesn't move.