Here are my answers :]
1. Let your ears heal fully. 3 months ago? Oh dear. How about waiting at least a year or 2. Seems hard, but it's better to be safe than sorry. Trust me.
2. AFTER your lobes are FULLY healed, start at the smallest size possible. So if you're at a 20G right now, when you start stretching, start at an 18G. If you're at an 18G right now, start at 16G. But remember, LET YOUR LOBES FULLY HEAL FOR A YEAR OR SO 
3. I have no clue on the Antiseptic part. I have no clue on the things you need to heal your lobe faster or what not, but Sea Salt Soaks always helped me. SSS. Vvitamin E and jojoba oils are everywhere on BAF. Buy some!
4. Oh the sweetness. Sharing tapers! I mean, i would never share something that has been in someone else's ear and place it in mines. Even if it has been cleaned about 4000000 times. What if her ears bled or something during the time of her stretch? Puss? Ewwwie. Germs! I've never heard anyone dying of sharing a taper, but i just don't like sharing things like that. i guess that's your decisicion to make buddy.
I am Chara.
Done :
1/2 Lobes downsized to 7/16''
Wants :
Snakebites. Later in life now.
Retired:
Right Labret 14G