Since you are 25, which is unusually young for autologous IVF, I have two pieces of advice. Both relate to selection of your clinic.
1. At your age, you will probably produce an abundance of eggs (oocytes). This will probably lead to an abundance of embryos, more than you can use in the fresh transfer cycle. Since most fresh cycles fail, the frozen embryo cycles make a handy and inexpensive backup plan. Many new to IVF greatly under-rate the value of frozens. They are safe and can be reliable, moreso than fresh embryos, especially in young and highly fertile patients. That is, the abundance of follicles and corpora lutea in young "high responders" produce lots of estradiol and progesterone, and the theory holds, these will diminish the chance of implantation in the fresh cycle. There are certainly publications of diminished pregnancy rates at the high end of ovarian response. This problem goes away in frozen embryo transfer (FET) cycles, and in donor cycles too. That is, the ovarian stimulation that produces the eggs is also what can temporarily compromise your endometrium in that cycle. My advice: Make sure your clinic has a strong record with frozen embryos (>30% delivery rates, preferably even higher). You don't want to go through stimulation again if you don't need to, and clinics vary a lot in frozen embryo success.
2. The greatest risk to the patient comes from a complication called ovarian hyperstimulation syndrome (OHSS). You don't want this. Patients can be hospitalized for days, and have more than 4 liters of fluid drained from their abdomen in each of several paracenteses. Then doing it again 2 days later, and again, and again. This tends to occur in young patients with many follicles. With fewer than 20 follicles, the chance of severe OHSS is low, probably less than 1%. But young patients frequently have more than 20, and 30 or 40 is not unusual (I've seen 50+). OHSS is a potential consequence of giving hCG "trigger" to a patient with many follicles.
This part may get complicated: If they "down regulate" you (suppress your pituitary gland to prevent premature ovulation) with a GnRH agonist (e.g. Lupron), the only "trigger" option they will have is hCG. If your response is very high (many follicles), they might even cancel the cycle to avoid OHSS rather than administer the hCG. You don't to go through all that stimulation and then get your cycle canceled with no eggs retrieved.
If they down regulate you with an antagonist (e.g. ganirelix acetate), then they will have the option of using either hCG or a GnRH agonist to "trigger ovulation" (technically, they induce final oocyte maturation). The agonist trigger is associated with greatly decreased risk of severe OHSS. In fact, it almost eliminates the risk and, to date, nobody has published a report of a severe case after agonist trigger. The downside is that, to date, the agonist trigger is associated with lower ongoing pregnancy rates in the fresh cycle. The embryos are great, and they will implant just fine, but they won't stay, apparently because of some problem with the endometrium (note the corpora lutea I mentioned above are not functioning after agonist trigger). What this means is a high rate of early pregnancy loss following agonist triggers, and this has been published in the two main prospective randomized trials of agonist vs hCG triggers. But the embryos work great in frozen embryo cycles, with no elevated early pregnancy loss rate. My advice: Seek a clinic that knows about agonist triggers (>50 cycles experience) and, again, has a strong FET program. That way you won't have to get your cycle canceled before egg collection and you'll still have a great shot at a successful pregnancy after FET. You can even omit the fresh transfer and go straight to FET. That's up to you and your physician of course, but why go through a pregnancy that would likely fail (emotional cost, not to mention those progesterone injections and the D&C)?
Some sources:
Eliminating OHSS with agonist triggers:
http://www.ncbi.nlm.nih.gov/entrez/quer ... med_docsum
Early pregnancy loss in fresh cycles with agonist triggers:
http://www.ncbi.nlm.nih.gov/entrez/quer ... med_docsum
http://www.ncbi.nlm.nih.gov/entrez/quer ... med_docsum
Best of luck with whatever you do.