I'm not actually very good at using these either but my main tip would be to make presets for your characters!! The models are very cartoony so I spent a little time messing with the proportions until they were relatively close to my characters! Here's the ones I used for the main 3 of matchmaker (I didn't use models much in mm, but they helped a lot with some tricky panels near the end!) more below the cut
i do this too! it's extremely useful for keeping proportions between characters consistent, esp. for people whose brains have more trouble with things like perspective and relative size. i have a giant library of 3D poses at this point separated into folders, i like to start with a pose that's similar to what i want and adjust it rather than start from scratch every time. saves a lot of time you'd otherwise spend fiddling.
CSP's models have the advantage of being right on the canvas and adjustable Right There if you want, but i find DesignDoll's posing controls a little easier if you just can't click with the CSP ones
