The Republican majority in the house will be small, anywhere from 218-217 to 220-215 or thereabouts. They have a 53-45-2 majority in the Senate (plus the VP, who votes whenever there is a tie). There will be Republicans who will need to be convinced on some votes, especially in the Senate where Collins, Murkowski, and Romney are not Trump supporters.
I think this allows us to dismiss the hysteria around Trump running roughshod over the country. His majorities are slim and will require some give-and-take on occasion. The most likely strategy by the Democrats will be to delay and impede anything he tries to do for two years and hope that they take back congress in the midterms. I think they probably will make gains in 2026, as that is usually the case whenever an election ends in one party having control of the White House and congress.
I can't help but get the impression that Trump learned a LOT of lessons from his first term, and appears to be focused on getting his team in place and avoiding the mess from 2017, where he struggled to get his administration staffed. He is prepared to hit the ground running with a set of plans that he intends to try and get done as soon as he is in office. I am hopeful that this new and focused version will make things better. But four years is at once a very long time and a very short time.