How should I go about getting hairline lowered? (photos)

Based on your photos, you appear to have similar features to others who undergo these procedures.  Of course an in person consultation is best.  Most of my patients would choose the hairline lowering and later undergo a transplant just to reshape everything to give you a more rounded and feminine hairline.  

I see many patients are self-conscious about a high hairline and or thinning hair. Lowering the hairline can be performed in a one-stage procedure or a multi-stage procedure depending on the desired result.  
In a one-stage forehead reduction surgical procedure, a carefully placed and camouflaged incision is made along the hairline and used to advance the hair bearing scalp and shorten the forehead in one surgical procedure. This is the most common method that patients choose, as it is quicker and only requires one procedure. Another option for hairline lowering is hair transplant, which can be performed to lower the hairline. Hairline lowering with hair transplant does not require any linear incisions along the hairline, but does not usually attain the same density as a hairline advancement procedure with only one hair transplant session. Most patients will need at least two transplant sessions for the best results.
In some cases, patients will choose to combine the two techniques: they will have the one-stage hairline advancement procedure to move the hairline down a few centimeters, and then come back 6-12 months later to have a few hair transplant grafts placed just in front of, around, and in the scar in order to camouflage it even more. This entirely depends on patient preference, their particular anatomy, and how well they heal after surgery.All the best,

Hair line lowering or forehead reductions may be great option(s) to address your forehead.  The first step is to educate yourself with what is possible and the types of surgeries out there.  The best way to understand your options would be to have a consultation with a doctor who does these type of procedures on a regular basis.