The side effects of antiandrogens listed on the site: deep vein thrombosis, pulmonary embolism, reduced blood pressure, frequent urination, prolactinomas and meningiomas (TUMORS), blood clots again, B12 deficiency, depression, severe liver toxicity and lung toxicity.
The side effects of testosterone listed: THE SITE LINKS TO A DEAD LINK LOL. WebMD says: increased risk of developing prostate abnormalities, breast enlargement, blood clots, worsening of sleep apnea, increased aggression and mood swings, and increased risk of heart attack and stroke.
Like you said, you aren't mean to do this yourself.