Mine is all done on my laptop. I don't use specific genealogy software, I use omnigraffle (mac equivalent of microsoft visio) to document my family tree. I have documented my ancestors as far back as I can (i.e. I have all 32 great-great-great-grandparents, but only 11 of my 256 great-great-great-great-great-great-grandparents, but still they are all on the tree); however with siblings, cousins etc I have only included the generations that can be exhaustively researched, so all the descendants of my great-great-great-grandparents, i.e. as far out as my 4th-cousins. Although I have come across some fifth-cousins, they are not on my family tree as I want to give a full picture of each generation I include. I have folders for each person organised in iphoto so that if you click on the name of someone in my family tree, all documents and sources for them come up, as well as any photos of them. As well as birth, death, marriage, census etc, I also keep transcripts of conversations with relatives or emails so I know exactly where I got the information. I also keep transcriptions of info I got in parish records, dated with the date I consulted the records. I confirm any info I get by word of mouth or email through searching records, however I find it helpful to know where I originally got it.
So I guess I'm pretty methodical. At the very start (when I was 14) I wasn't at all methodical, but I realised once I hit my seventh Pat Doyle that I would need a better system and started scanning everything I had and meticulously organising everything into folders. I took a long break from the family tree and went back to it when I was 18, and transferred everything from my parents' computer to my own laptop. Since then it's been much easier because I can take all my information with me when I go to consult records. My computer is full of birth, marriage and death certs, census records, etc, and each is attached to every person named.
I do have a lot of my tree on ancestry.com, but am thinking of taking it off because people keep copying my info and photos to people with the same names who are very obviously not the same people.

However I owe a lot to having my tree on ancestry.com, I've found a lot of relatives that way. I think soon it might be time to take it off though.
Not using a genealogy computer programme means I can lay my tree out exactly as I want to. I've attached a photo of my layout (low quality so names etc can't be seen). Pedigree chart is in the upper centre, the columns at the side are siblings, cousins etc of ancestors, the columns underneath the pedigree chart are ancestors further back than the pedigree chart goes and under that are my grandparents' birth certs (minus my Nanny's because I stupidly gave it to her *before* scanning it, and I keep forgetting to ask her can I scan it whenever I'm in her house, however that will be going on the tree at some point soon). The photos at the top are my ancestors, at the bottom I have photos of siblings of my ancestors and above that I have wedding photos of siblings of my grandparents. The photos on either side are family group pictures and photos of places relevant to my family (i.e. the house where my mother's paternal ancestors have lived since 1606, the windmill my great-great-great-grandfather built). The tree is still very much a work in progress but there is a place for everything to go when I eventually find it...