Politically, quite well... even with the Senate changing hands. He's managed to get his tax cut through more or less intact, enough to take political credit for it.
Economically, I don't like the tax cut. It does nothing to simplify the tax code, which is a huge mess, and I'd rather see larger debt repayments versus tax cuts anyways.
Overall, he's been effective in pushing his agenda but things will only get more difficult from now on especially with the Democrats controlling the Senate. He's done enough to satisfy the right wing of the Republican party, now he has to move towards the centre and work with the Democrats. So, no major screwups yet but its still early... give him some time.