1. Hot combs are not good for relaxed hair. Unless you know what you're doing, they can be tricky on natural hair as well.
2. There are lots of ways to lay your edges down - like using scarves. You don't want to use any type of direct heat on your edges every day. Keep them moisturized and tied down and they will lay flat. Note: if you straighten your hair, use a flat iron on clean, dry hair that has some type of heat protectant in it. Wrap, cross wrap, or pin curl at night to maintain. Limit direct heat to no more than once a week, less if possible.
3. When stretching, it's good to do low manipulation styles like braidouts or bantu knots. Twist - outs can look thin on relaxed hair.
4. I believe Allandra rollerset throughout her transition. You can look for rollersetting tutorials on youtube.
5. You can also look for "tips for stretching relaxers" on youtube. Here's two vids by Traycee:
YouTube - Tips For Stretching Your Relaxer
YouTube - 22 Weeks Post Relaxer ..Stretching Tips
Also, vids by Nina Pruitt are good. She is transitioning and is well over one year post-relaxer.
6. Deep condition alternating moisture and protein. Moisture to soften your hair and keep it moisturized, of course. Protein helps to reinforce the line of demarcation and prevent breakage.
7. Slowly increase the time you stretch. (But, if you're going for Allandra's hair, she is natural so you would be trying to transition....)
8. I do braidouts and buns religiously when stretching. Once I get past 4 months, I co-wash to keep my hair moist.
I've learned to work with my texture, rather than against it. I don't believe in constantly straightening new growth.