I would start at .5mg x 2 a week (Monday/thursday)
then .75mg x 2 a week after 2-3 weeks.
Repeat this titration pattern as needed to arrive at a dose that is effective for reasonable weight loss without side effects. Somewhere between 2 mg and 8mg is where most people end up
if they experience side effects, back off the dose nominally for the next week-2 weeks to manage the side effects.