Hello Jillm
You can download the LPA's and do them yourself , the fee for registering an LPA is bout £120 double that if you do both financial and health n welfare, plus their will be a fee for the person who certifies mum has the capacity to understand and agree , your mums consultant may be willing to undertake this .
Lpa's can only be made while the donor still has capacity , if you leave it to late their is the option of deputyship but its expensive n frought with problems
I believe but am not sure that if on a low income their is a reduction in registering lpa's .
Id say have a go at doing them yourself , just make sure you dot all the i's cross all the t's double check them get someone else to double check .
People on here may help ,
Also maybe Age uk (age concern) or the Alzheimers society may fill them in for you , or at least check them over
I do recommend that you take out both financial and health n welfare,
Hope this helps
Ps you can download the forms and info from the OPG
When you do register them ensure you request the two free certified copies