Frozen pipes may be somewhat common in the wintertime. If your pipes do freeze, you want to check and see if the pipes are busted or cracked. If your pipes are frozen, you can use a hair dryer to try and thaw out the pipes. However, if this will not work, you will need to call in a water line repair who may either try and thaw the lines out another way or they may just end up replacing the section of the line that is broken.
There are two, one on each side of the toilet, closet bolts which hold the toilet to the floor. If there are caps over the bolts, remove or pop them open. Using a small crescent wrench unscrew the nuts from the bolts. Alternate side to side when unscrewing this will be much more important when reinstalling the water line repair bolts but alternate anyhow.
If you bought the same unit it should line right up, if you were unable, you will need to remove or add length to the existing piping. This may require you to splice together copper with plastic, don't let this scare you the hardware store will have all of the necessary parts.
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Plumbers, like all other companies, are required to be on time and act professional. If they have called before hand to notify you then, this can be overlooked. However, if they turn up without apologising for being late, then they may not be the right plumber for you. Remember first water line repair impressions are everything. If they lack a good first impression then this may indicate that it is going to have an impression on their work. In most cases, you would have taken the time off work for the plumber, and what can be worse than waiting all day waiting for them to arrive?
And the way to know what's sufficient? Well, until the work is done an the bill paid you won't know for certain, but this is the best that can be suggested and normally works very well.
Sometimes there can be complications of broken toilet flanges, closet bolts or rotted sub-flooring. If you find any of that in your situation, it will need to be repaired before reinstalling the toilet.