shifting into drive is tricky, shifting into 1st or 2nd is almost impossible (auto)

[TechGeddon]

This has just started at random.
shifting into drive is harder (not motion wise, but i have to go closer to 1st gear to get drive to click in)
trying to shift into 2nd, i actually have to pull the shifter with some force.
trying to shift into 1st is a feat where i fear im going to break something.
trying to shift out of 2nd or 1st to Drive position is very resistant as well.

from park to reverse to neutral no problems.

iv already taken and examined closely my "shifting assembly" in the cab and im unable to find the issue.
anyone have an idea what i should check next?
(keep in mind im not rich, not very Technical (im more a wires guy) and im in an apartment parking lot. so pulling the motor, or getting it up on stands is essentially impossible.

[TechGeddon]

Solution: Took it to local GM Dealer. Issue was corrosion/rust/dirt in bottom boot of cable line.
flushed with cleaning oil and break free.. Flooded line with grease. and now it works like a dream.

[Daox]

Thanks for the follow up!

[Pickles]

Thanks for the follow up!

+1. Glad to see the issue was solved and relatively easy fix