It's a lot if you look at the whole thing, but if you do little by little, it's not as overwhelming and it can be done pretty quickly.
The hardest part I dare to say is getting the stupid LORs in time. Filling out the information, course grades, volunteer, shadowing can be done in a matter of a few hours or within a day if you sit down and do it, but getting letters is contingent on many factors that you cannot control, such as how busy the professor is, how well the professor remembers you, how many other letters he/she has to write, if he/she has a class during the summer or not, if he/she has a research ongoing, etc, etc.
So, what I'd do before doing anything is go talk to your LOR writers well in advance and have them get it ready as close to June as possible. If it looks like it's not going to work out, find someone else and repeat the process.
Personal statement requires a little bit of brainstorming and editing, so I'd start that around March or April as well.