Thank you, Mustardseed, for your reply.
1- You can needle aggressively, there is no problem. Microneedling does not remove layers of skin so it always heals very quickly no matter how densely you needle. There are so many skin cells in one scar that you cannot even hit all of them and the cells will migrate from the surrounding tissue and that is also a reason why it heals so quickly.
In reply #14 in this forum thread: https://http://forums.owndoc.com/dermarolling-microneedling/my-1-year-dermaroll-experience-for-acne-scars-%2815-sessions%29/msg5502/#msg5502
our forum member describes he only got results after starting to needle aggressively (it is not always the case).
I do not recommend needling/stamping the nose aggressively unless you started gently and tested several times how the scars on the nose react because this area is tricky and can heal unpredictably. In your case it turned out OK so you can do it aggressively even on the nose. But in this area, initial very gentle treatment testing is a must.
2- Microneedling works without using any additional products. Supplying the skin with vitamins helps forming "ideal" conditions in the skin for collagen production etc.
Infadolan contains vit. A and D and is semi- occlusive (keeps the moisture in). It should be applied until the treated area heals and goes back to normal. If you are prone to acne, do not apply Infadolan more than right after the treatment and use creams that you know do not break you out.
If you want to make sure your skin is saturated with vit. C for the "needling day", apply it for four consecutive days prior to needling and then continue applying a few times a week. You do not have to remove natural skin oils to apply vit. C but vit. C is not going to penetrate a layer of Infadolan or other very oily substance. That is all. If you have visible vit. C residues on the skin in the morning or the skin feels sticky wash it off with tap water. There might be some white residues if you use high concentration.
3- I recommend a healthy diet, avoiding junk food and especially sugary soda drinks and of course no smoking. External application of vit. C is important because you cannot achieve really high levels in the skin by taking it orally. Various oral supplements can also be useful nevertheless there are no studies showing that specific supplements improved results of any skin procedures so it is not possible to make any such definite lists or recommendations. It is worth trying, that is all I can say.
4- it is just important is not to rub on scabs (if you get scabs after microneedling) because removing scabs prematurely can leave a scar. Otherwise it is OK.
5- No, it is not going to hurt your goal. They should also be kept moisturized after the treatment. To target the pressure massage on very small hypertrophic scars, you can use something small to apply the pressure (the thicker side of a toothpick or something like that). https://http://forums.owndoc.com/dermarolling-microneedling/what-to-do-about-hypertrophic-scars/