One piece of advice I can give. If converting from larger base to smaller base, you can divide the number by the smaller base and read the remainders in reverse order:
14 base 10
convert base 2
14%2=0 (then divide by base)
7%2=1
3%2=1
1%2=1
read in reverse: 1110
When converting from smaller to larger base:
1110 base 2
convert base 10
1*(2^3)+1*(2^2)+1*(2^1)+0*(2^0)
8+4+2
14
You might find it easier to first convert to base 10, than dividing in other bases.