Guys, thank you for your replies. You saved me from buying wrong size.
Would never thought that smaller size is more comfortable to work with.
Just looked through youtube installation guides for large wall decals like trees. And all are made from smaller sized ones (most likely 24")
Which is best option to go for that size?
I see mostly 2 choices -> Rolland GX-24 and Graphtec CE-6000-60.
Which?
p.s. here is the kind of decals i am planning to create just to give you an idea ->
https://dl.dropboxusercontent.com/u/61690214/sample_tree.jpg
(consists of tree, separate leaves, separate flowers, separate birds)