How difficult is Beginning Computer Science?

Well firstly you are going to need to have a high level of interest in computing in general. Some of those topics can seem very boring to people who think that just because they spend days on end in their rooms playing games that these subjects will interest them! BIG MISTAKE! Networks especially are very material heavy but this is something you will get used to using by doing jobs like setting up home networks for people (which is a handy way to make extra cash btw) the computer architecture is fairly strait forward, learning about the hardware etc. As you mentioned you were good at maths the boolean logic Will come easier to you, all that's involved are two theorems and maybe 6 to 8 axioms which once learned off are simple! With the computer languages you will be probably started off with java programming and some basic embly language which ain't that difficult, the java being the trickier of the two though. But with all programming languages people have eureka moments where it all of sudden makes sense! So if you have a genuine interest in computers all of this will interest you hopefully and you will surprise yourself how much you could learn in like the first semester!! hope i helped!!