I'm about 300 lbs and want lipo and BBL. Do I need to lose weight to get that procedure done?

Thank you for the detailed question. Patients with a BMI of 30 or lower are eligible for liposuction and BBL. If your BMI is over 30, you must lose weight until you reach the required BMI to be an eligible candidate for any cosmetic surgical procedure. For more information, please visit our webpage. 

Hello, thanks for your question and provided information. Yes, you need to have your BMI less than 32 to have liposuction and bbl, it will be safer for you and you will get optimal and better results. 
Advantages:
One treatment may be all you need to reshape problem areas
Treat more areas—and larger areas—in one procedure
May be performed with either local or general anesthesia
More consistent and predictable result than noninvasive treatments
Liposuction, sometimes referred to as "lipo" by patients, slims and reshapes specific areas of the body by removing excess fat deposits and improving your body contours and proportion.
Different areas of treatment:
Thighs
Hips and buttocks
Abdomen and waist
Upper arms
Back
Inner knee
Chest area
Cheeks, chin and neck
Calves and ankles
Liposuction can be performed alone or along with other plastic surgery procedures, such as a facelift, breast reduction or a tummy tuck.
What liposuction can do?
Liposuction is not a treatment for obesity or a substitute for proper diet and exercise.
It is also not an effective treatment for cellulite—the dimpled skin that typically appears on the thighs, hips and buttocks—or loose saggy skin.

Ideal candidates are at a stable weight,  in good health , and have excess fat in some parts of the body and too little in other regions.  Gaining weight before the procedure is to no advantage and when you lose weight again the fat cells will shrink just like the donor site fat cells.  Typically, the transferred fat results in a significant increase in volume of the body site being treated.