Most people will find it easier to use a gui, so it's probably easiest to install
All the power and control of the command line is still there under the hood.
See the download and install section:
First you need to install msysgit from here
Given you'll mostly be using tortoise then probably worth disabling window explorer intergration and all the other stuff in select components and also choose use git bash only for the path setup, this should avoid screwing anything else up on your box. Default line ending handling (windows out/unix in) is fine.
Then install the right bitness of tortoisegit front end, default install is fine I use plink for ssh and it works well enough.
Right click in explorer in the directory where you want to get the source, choose git clone (putting in the correct git patch if required) then enter the read-only project location ( git://git.code.sf.net/p/hcfr/code ) in the url and make sure the checkout directory in the directory bit is what you want.
To get updates right click on theroot of the checked out tree and select Git/Git Pull and then K to the message box, if you've made local changes you'll need to commit them first before it will allow you to pull.
You can use git commit off the right click menu to do this, this will only change your local copy of the repository and you can go back at any time.