May I ask why the stamp would be preferable to a roller, is that just because it is an isolated area i am treating?
Yes. For targeted, intensive treatment of a scar, a dermastamp is much better.
Should I purchase the 0.5 mm or 1 mm?
If the scar seems shallow, buy a 0.5 mm. A 0.5 mm length reaches the top of the dermis so it should reach shallow scars.
Obviously if not I will opt for the 1 mm, but how much more downtime would that require?
This is individual. If you do not work at the weekend, stamp the scar on Friday afternoon and you will see how long it will stay red. With a 0.5 mm, the redness is likely to be more or less gone in the morning.
And should I use any of your other products, for example the Infadolan? Would this speed the healing or make it more efficient?
Infadolan promotes re-epithelialization, keeps the stamped area semi–occluded to prevent water evaporation and supplies vit. A and D but you can keep it moisturized with something else.
I have heard that scarring takes an average of 7 months for redness to subside. Is this correct in your opinion and would the microneedling speed up this process or would it continue as normal?
Maturation of a scar takes many months and the redness can in some cases persist much longer (in burns, stretch marks, deep injuries etc.) but your type of scar will almost certainly significantly fade within eight months. You may be left with a white scar after that. If depends how deep the mole was.
Microneedling will speed up the process because it speeds up the turnover of the skin and it will soften the hardened scar tissue.