anyone good with electronics should be able to answer this

i picked up some 3mm bright leds and..
question 1:
leds specs
Forward Voltage (mA): 3.0-3.4
Forward Current (V): 20-30
are these compatible with the hl wiring without resistors as was suggested in another post?

question 2:
if a resistor is needed can i have it further along the wire or does it have to be connected directly to the led?

question 3:
can i solder wires right up close to the led and cut the legs short or will the soldering heat kill it? im trying to get them in some very tight areas

thanks