I find that I have the same kind of routine ritual everytime I get a new cel package in the mail. It's almost therapeutic going through it. Now this may seem obsessively OCD, but here's my new cel ritual I go through everytime I get a new delivery. Mind you, I act like I'm holding the friggin' Constitution in my hands with each cel, so if I'm a bit overboard, it's okay to say so

1) Special short blade pocket knife to remove package tape.
2) Inspection of contents, number of cels/sketches/etc.
3) Inspection of cel and protective bags.
4) Queue up corresponding episode to enjoy seeing the cel on screen in your hands. (Most enjoyable part of the routine

5) Check if douga drawing is stuck to the cel.*
* If the douga is stuck, I literally stop everything and perform a very delicate procedure to remove it. I only use my hands and a small fan to keep them from getting too sweaty. This process can take as little as 5 minutes to as much as an hour depending on the amount of paint (red & black paints stick more). The key is to not be impatient and slowly knead the paper off with the tips of your fingers. If anyone's done this, you know that it almost feels like you're performing open heart surgery. Very nerve racking.

6) Scan douga first.
7) Scan cel second.

9) Rearrange previously owned cels/sketches in Itoya books.**
** I do this for several reasons. I use Itoya ZigZag Frost 11" x 14" horizontal albums, mainly because of their size and the frosted plastic matte in each sheet. Opening the album from left to right, I place the cel in front of the matte and it's corresponding sketches behind the matte, that way when you flip the sheet you can view the sketch to that particular cel on the back side. The cel placement in the book is not arbitrary, in fact a lot of thought goes into where I place the cel in it's album as I like to keep them grouped and in order by series, subject (characters, mechs, etc.), and episode number. The rearranging also allows for the built up gases and molecules to escape and let the cels and sketches have some fresh air every so often.
10) Place cel & sketches in it's appropriate sheet in the Itoya.
11) Photoshop Scanned Images (My scanner is tiny and requires two scans of each sketch and cel to complete the entire image, and up to 4 scans for oversized cels)
12) Post edited Images to RS with descriptions. (If I get a large haul, I'll break it up and post 3 or 4 at a time every other day).
Like I said, this whole process may seem a bit daft, but actually it's pretty enjoyable and is also meant to preserve & present the cels as best as possible.
Does anyone have a similar ritual or routine they go through when they receive a new cel that they'd like to share?