The only concern I have is that HP have software (for touchpad, internet, sound, graphics &c...) & I am unsure whether it'll be compatible
Firstly, the Windows drivers won’t work in Linux… not a problem, Linux contains its own drivers… most if not all of the devices you mention will probably “just work” without the need for you to manually install any drivers.
Secondly, neither will Windows software… so though things like M$ Office aren’t going to run in Linux, there are nearly always Linux alternatives (99.999% of which are free)… for example, LibreOffice will be able to read/edit/write your M$ Office docs etc. and will come pre-instaled in most Linux distributions.
But if you want to “test drive” Linux, why not download a LiveCD ISO image, burn it to a CDR or DVD-R, then boot to it, and select “Try Ubuntu”.
A LiveCD will boot to a working Linux desktop without making ANY changes to your hard drive… you can then test compatibility, and get a “feel” for Linux without changing your Windows setup at all.
(though obviously it will be slower than a hard drive installation, and you won’t be able to save any changes)
May I suggest Ubuntu:
http://www.ubuntu.com/
download the LiveCD image from here:
http://www.ubuntu.com/download/ubuntu/download
To burn the ISO image to a blank CD/DVD, Your best bet would be to download ImgBurn on your Windows box (it’s free):
http://download.imgburn.com/SetupImgBurn_2.5.2.0.exe
Install it, then see here for instructions on how to burn an image with ImgBurn:
http://neosmart.net/wiki/display/G/Burning+ISO+Images+with+ImgBurn
on the second picture, where it says Write Speed: AUTO … change that to 4X
and put a tick in the Verify box.
If you have any further questions… just ask 
[EDIT]
If you post the model of your HP laptop (usually on a sticker underneath), we may be able to check if there are any know issues with drivers etc.