Hi I'm 5ft and 95 lbs. I'm trying get 400cc HP - is that gonna be too big for me? (Photo)

Thanks for your inquiry but without an exam or measurements it is impossible to advise.  If you are having consultations with board certified experienced plastic surgeon they will make sure you to advise you if you are going to big for your tissues to handle.  Good Luck.

Thank you for the question and pictures. 
Generally speaking, the best online advice I can give to ladies who are considering breast augmentation surgery (regarding breast implant type/size/profile selection) is:
1. Concentrate on choosing your plastic surgeon carefully. Concentrate on appropriate training, certification, and the ability of the plastic surgeon to achieve the results you are looking for. Ask to see lots of examples of his/her work.
2. Have a full discussion and communication regarding your desired goals with your plastic surgeon. This communication will be critical in determining breast implant size/type/profile will most likely help achieve your goals.
In my practice, the use of photographs of “goal” pictures (and breasts that are too big or too small) is very helpful. I have found that the use of words such as “natural” or "C or D cup" or "too big for me” etc means different things to different people and therefore prove unhelpful.
Also, as you know, cup size varies depending on him who makes the bra; therefore, discussing desired cup size may also be inaccurate.
3. Once you feel you have communicated your goals clearly, allow your plastic surgeon to use his/her years of experience/judgment to choose the breast implant size/profile that will best meet your goals. Again, in my practice, this decision is usually made during surgery ( after the use of temporary intraoperative sizers).
I hope this, and the attached link (dedicated to breast augmentation surgery concerns), helps. Best wishes.

Based on these photographs it appears that 400 cc is well within the range that you would be pleased with.  The best thing to do is to try on sizers.  Only you can know exactly what will look best based on your perception breast size.