PRESSED TIN PANELS aluminium panels are very easy to use.  They can be cut with an angle grinder or tin snips.  Generally they are glued on, and then small nails or rivets used to help secure them in place, and hold the overlapped join nice and tight.
We use a gorilla glue type of product, in a corking gun.  Smear the glue evenly over the back of the panels, and glue them onto your hard surface (more specific details in attachments).  You might then want to use 2 or 3 small nails down the 'overlap' or end of the panel (try and place your nail or rivet into a detailed part of the panel so it won't be noticed).  
The panels overlap, rather than butt up to each other.  They actually come 1820mm x 920mm - so have 10mm on all sides to allow for a 10mm overlap if you are using more than 1 panel.  The finished size is 1800 x 900, or 1800 x 600mm.
PRESSED TIN PANELS® aluminium panels need to be painted or powder coated - if they are left 'raw', eventually they will dull off and oxidise over time.  In a bathroom, outside or for a splashback it is recommended to powder coat the panels - this will protect them the best from fat, oils, moisture and heat, and make them easy to clean and maintain.  For a ceiling or feature wall you can paint the panels if you prefer - it is imperative that you use a primer before doing your top coat, and Dulux step 1 is recommended by PRESSED TIN PANELS.  If you like the aluminium look, then you can paint or powder coat the panels in a 'clear gloss' which retains the aluminium look and still seals in the panel and protects it.
The panels often do have small scratches present on them, due to the fact that they are aluminium.  Once they have been primed and painted, or powder coated then the scratches tend to disappear.

With regards to using the panels behind a hob, please check with your local council as to their requirements regarding a heat proof product.  Some might require you to use a 'heat proof' substrate behind the PRESSED TIN PANELS aluminium panels, such as fire proof gib, or Hardies cement board.  
Specific installation and cutting instructions are in the PDF's listed below.  These are the instructions as written and supplied by PRESSED TIN PANELS.
Please feel free to ring di Rosa though if you have any questions as you go, or want clarification on anything.