I actually advise my patients against liposuction for the purpose of weight loss.
I believe dietary and lifestyle modifications will give you more joy in the long term. Addressing this usually takes up a lot of time in the consultation but I find it worth the while.
Large volumes can be removed safely with the right preparation and medical care during and after the surgery, but as a guide liposuctioning more than 2 litres of supernatant fat requires a stay in hospital.
Hope this is useful.
Best wishes
