You might think about looking for a therapist who has gender on their list.
And you might simply talk to them, about what really moves you. Alone talking helps.
Its their job to keep it confidential, and you can take the time you need.
Being transgender was a huge plus in other cultures. We have an insight into male and female thinking patterns, which was highly sought after.
There is a brochure by the british NHS called "doh-transgender-experiences.pdf" which might help... only part I would disagree with is page 7 where they state stress... for many its a huge relief....
well you could start with easy reversible steps if really unsure... growing your hair out, looking for some womens clothes, like some trousers etc... second hand stores could be a source... some womens accessoires which remind you of femininity... I'd say go with a feeling of joy...
for losing a bit of weight you could think about a more vegetarian diet, and cutting on high sugar drinks... more fruits and vegetables, maybe more tea and water... and a bit of exercise like swimming, walking or biking, without overdoing it... maybe half an hour a day, a few days a week.