Ballotpedia is one of our favorite reference websites. It is like Wikipedia for politics, but more in-depth and reliable.
Ballotpedia just released a statistical analysis of federal judicial vacancies as Trump enters office, and likely to become available during his term.
That takes on great importance given that Democrats in 2013 busted the filibuster ("went nuclear") for judicial nominees below the Supreme Court level, and even as to the Supreme Court it's likely Republicans might go nuclear. So to the extent federal judicial vacancies currently exist or become available in the next four years, Trump should be unstoppable in filling those seats (unless Republicans lose the Senate in 2018, which is unlikely).
We pointed out the magnitude of this late last year, Dems’ Nuclear Option will allow Trump to fill over 100 court vacancies quickly.