I am slower than the shlichei tzibbur in my shul at Full Tachanun (Shacharis Mon, Fri). I usually get about half-way through by the time they start taking the Sefer out.
Do I keep going, ignoring the taking out sefer section?
Do I just pause for the kria and keep going in between leining and after?
Assuming it is correct to keep going in tachanun, if the sefer is being walked to the bima and I am during nefilas apaim, should I stand? Stand and lean on a shtender with nefilas apaim?
If I know I can't make it through all of tachanun by sefer time, should I skip parts to ensure I arrive on time?