You can have the “perfect” embryo in the “right” place and there is still no guarantee of a BFP. My only advice would be not go in with the expectation that it will work first time. As hard as that is. PPs are right in saying that the first cycle is essentially experimental and largely the product of sophisticated guesswork on behalf of your FS depending on your specific set of circumstances. There is no way of knowing how your body will respond to the treatment and if any other issues will be uncovered along the way. If that first cycle goes awry or ends in a BFN the emotional crash can be devastating when you have so much riding on it. Success on the first cycle is the exception rather than the rule. I hope you are one of the lucky ones. But if your surrogacy was a success. There is a higher chance of her IVF being a success too. Do hope for the best.