My trans ass won't have future children so reading this makes me self-concious at best.
Cis lez-couples don't have it near as bad, it's at times like these I feel like the T should be removed from the abbreviation.
near as bad as.....who? trans lesbian couples? they would have the exact same problems as not having the sperm + egg combination. trans-cis lesbian or gay couples would, optimally, have the sperm + egg combo so there's no inherent child-bearing problem there. trans-cis straight couples, like cis lesbian couples, would probably not have the sperm + egg combo but if you're saying that straight couples in any way shape or form have it harder than gay couples then you're just flat out wrong.
A het trans woman wouldn't have a uterus, so that's out. And a post-op trans lesbian wouldn't have sperm at all. A pre-op lesbian may not have viable sperm depending on how long she's been on HRT and what particular drug.
As to gay trans men, I gather large doses of testosterone and uteruses (uterii?) don't get along all that well, which is what killed Robert Eads, subject of the documentary Southern Comfort. So you've may have questionable egg viability, again depending a lot on circumstances.
Now of course depending on the country you might have stuff like adoption, surrogacy, freezing sperm or eggs prior to transition, or donated sperm or eggs to complicate the equation in the other direction. Plus probably stuff I forgot to mention.